| Oceania | | level | 2 |
|---|
| topic | "Geography" |
|---|
| section | "Geography" |
|---|
|
|---|
| Ottoman Empire | | level | 3 |
|---|
| topic | "History" |
|---|
| section | "Post-classical history" |
|---|
|
|---|
| Opera | | level | 3 |
|---|
| topic | "Arts" |
|---|
| section | "Performing arts" |
|---|
|
|---|
| Orchestra | | level | 3 |
|---|
| topic | "Arts" |
|---|
| section | "Performing arts" |
|---|
|
|---|
| Ontology | | level | 3 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Philosophical branches and concepts" |
|---|
|
|---|
| Old age | | level | 3 |
|---|
| topic | "Everyday life" |
|---|
| section | "Family and kinship" |
|---|
|
|---|
| Olympic Games | | level | 3 |
|---|
| topic | "Everyday life" |
|---|
| section | "Recreation and entertainment" |
|---|
|
|---|
| Oral tradition | | level | 3 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Society and social sciences: General" |
|---|
|
|---|
| Obesity | | level | 3 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Health, fitness, and medicine" |
|---|
|
|---|
| Orbit | | level | 3 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Astronomy" |
|---|
|
|---|
| Outer space | | level | 3 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Astronomy" |
|---|
|
|---|
| Optics | | level | 3 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Physics" |
|---|
|
|---|
| Organism | | level | 3 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Biology" |
|---|
|
|---|
| Organic chemistry | | level | 3 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemistry" |
|---|
|
|---|
| Oxygen | | level | 3 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemistry" |
|---|
|
|---|
| Oven | | level | 3 |
|---|
| topic | "Technology" |
|---|
| section | "Food and health" |
|---|
|
|---|
| Ode | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Basics" |
|---|
|
|---|
| Oresteia | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of antiquity" |
|---|
|
|---|
| Oedipus Rex | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of antiquity" |
|---|
|
|---|
| One Thousand and One Nights | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of antiquity" |
|---|
|
|---|
| Othello | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of early printed book era" |
|---|
|
|---|
| On the Road | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of modern era" |
|---|
|
|---|
| One Hundred Years of Solitude | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of modern era" |
|---|
|
|---|
| One Piece | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Comics" |
|---|
|
|---|
| On the Consolation of Philosophy | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of antiquity" |
|---|
|
|---|
| Organon | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of antiquity" |
|---|
|
|---|
| On the Origin of Species | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of modern era" |
|---|
|
|---|
| Oxford English Dictionary | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of modern era" |
|---|
|
|---|
| Odyssey | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of antiquity" |
|---|
|
|---|
| Oku no Hosomichi | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of early printed book era" |
|---|
|
|---|
| Oboe | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Musical instruments" |
|---|
|
|---|
| Outsider art | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Contemporary art" |
|---|
|
|---|
| Optical illusion | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Concepts and forms" |
|---|
|
|---|
| Origami | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Concepts and forms" |
|---|
|
|---|
| Oil painting | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Concepts and forms" |
|---|
|
|---|
| Olmec colossal heads | | level | 4 |
|---|
| topic | "Arts" |
|---|
| section | "Sculpture" |
|---|
|
|---|
| Organ (biology) | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Basics_2" |
|---|
|
|---|
| Olfactory system | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Nervous system" |
|---|
|
|---|
| Ovary | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Reproductive system" |
|---|
|
|---|
| Oxytocin | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Biochemistry and molecular biology" |
|---|
|
|---|
| Ontogeny | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Animal ontogeny" |
|---|
|
|---|
| Organelle | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Organelles" |
|---|
|
|---|
| Oyster | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Mollusks" |
|---|
|
|---|
| Octopus | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Mollusks" |
|---|
|
|---|
| Ostracod | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Crustaceans" |
|---|
|
|---|
| Odonata | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Odonata" |
|---|
|
|---|
| Orthoptera | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Orthoptera" |
|---|
|
|---|
| Ostracoderm | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Agnatha" |
|---|
|
|---|
| Osteichthyes | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fishes" |
|---|
|
|---|
| Oarfish | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fishes" |
|---|
|
|---|
| Ophidiiformes | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fishes" |
|---|
|
|---|
| Ocean sunfish | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Tetraodontiformes" |
|---|
|
|---|
| Old World vulture | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Accipitriformes and Falconiformes" |
|---|
|
|---|
| Osprey | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Accipitriformes and Falconiformes" |
|---|
|
|---|
| Old World flycatcher | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Passerida" |
|---|
|
|---|
| Old World sparrow | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Passerida" |
|---|
|
|---|
| Ovenbird (family) | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Tyranni" |
|---|
|
|---|
| Owl | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Strigiformes" |
|---|
|
|---|
| Otter | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Carnivora" |
|---|
|
|---|
| Orca | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Cetaceans" |
|---|
|
|---|
| Opossum | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Marsupials" |
|---|
|
|---|
| Orangutan | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Primates" |
|---|
|
|---|
| Old World monkey | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Primates" |
|---|
|
|---|
| Orchid | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Asparagales" |
|---|
|
|---|
| Oak | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fagales" |
|---|
|
|---|
| Oleaceae | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Lamiales" |
|---|
|
|---|
| Orange (fruit) | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Culinary fruits" |
|---|
|
|---|
| Olive | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Culinary fruits" |
|---|
|
|---|
| Okra | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Botanical fruits used as culinary vegetables" |
|---|
|
|---|
| Oat | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Grains" |
|---|
|
|---|
| Oryza sativa | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Grains" |
|---|
|
|---|
| Onion | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Root vegetables" |
|---|
|
|---|
| Oral hygiene | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Health and fitness" |
|---|
|
|---|
| Occupational safety and health | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Health and fitness" |
|---|
|
|---|
| Opium | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Drugs and pharmacology" |
|---|
|
|---|
| Obstetrics and gynaecology | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Oncology | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Ophthalmology | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Optometry | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Otorhinolaryngology | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Organ transplantation | | level | 4 |
|---|
| topic | "Biology and health sciences" |
|---|
| section | "Medical procedures" |
|---|
|
|---|
| Offal | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Meat and other animal products" |
|---|
|
|---|
| Orphan | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Marriage and parenting" |
|---|
|
|---|
| Oral sex | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Sexuality and gender" |
|---|
|
|---|
| Orgasm | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Sexuality and gender" |
|---|
|
|---|
| Orienteering | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Other individual sports" |
|---|
|
|---|
| Olympic weightlifting | | level | 4 |
|---|
| topic | "Everyday life" |
|---|
| section | "Other individual sports" |
|---|
|
|---|
| Ob (river) | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Asia_2" |
|---|
|
|---|
| Ohio River | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "North America_2" |
|---|
|
|---|
| Orinoco | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "South America_2" |
|---|
|
|---|
| Orange River | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Africa_2" |
|---|
|
|---|
| Outback | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Oceania_4" |
|---|
|
|---|
| Oman | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "West Asia" |
|---|
|
|---|
| Ontario | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Canada" |
|---|
|
|---|
| Ouagadougou | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Burkina Faso" |
|---|
|
|---|
| Oran | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Algeria" |
|---|
|
|---|
| Omdurman | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Sudan" |
|---|
|
|---|
| Osaka | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Japan" |
|---|
|
|---|
| Oslo | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Norway" |
|---|
|
|---|
| Omsk | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Russia_2" |
|---|
|
|---|
| Odesa | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Ukraine" |
|---|
|
|---|
| Ottawa | | level | 4 |
|---|
| topic | "Geography" |
|---|
| section | "Canada_2" |
|---|
|
|---|
| Old Kingdom of Egypt | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Africa_2" |
|---|
|
|---|
| Olmecs | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Americas_2" |
|---|
|
|---|
| Odrysian kingdom | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Europe_2" |
|---|
|
|---|
| Ostsiedlung | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Western Europe" |
|---|
|
|---|
| Oyo Empire | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Africa_4" |
|---|
|
|---|
| Ottoman wars in Europe | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "Eastern Europe and Central_2" |
|---|
|
|---|
| Operation Condor | | level | 4 |
|---|
| topic | "History" |
|---|
| section | "South America" |
|---|
|
|---|
| Order of operations | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Basics" |
|---|
|
|---|
| Open set | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Geometry" |
|---|
|
|---|
| Ordinary least squares | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Statistics and probability" |
|---|
|
|---|
| Observational study | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Statistics and probability" |
|---|
|
|---|
| Ordinary differential equation | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Calculus and analysis" |
|---|
|
|---|
| Operations research | | level | 4 |
|---|
| topic | "Mathematics" |
|---|
| section | "Other" |
|---|
|
|---|
| Oprah Winfrey | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Hosts and performers" |
|---|
|
|---|
| Osamu Tezuka | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Cartoonists, comics artists, and illustrators" |
|---|
|
|---|
| Oscar Niemeyer | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Architects" |
|---|
|
|---|
| Ovid | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Europe" |
|---|
|
|---|
| Omar Khayyam | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Asia_2" |
|---|
|
|---|
| Ouyang Xiu | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Asia_2" |
|---|
|
|---|
| Oscar Wilde | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "UK and Ireland" |
|---|
|
|---|
| Orhan Pamuk | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Asia_4" |
|---|
|
|---|
| Ousmane Sembène | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Directors" |
|---|
|
|---|
| Orson Welles | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Directors" |
|---|
|
|---|
| Origen | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Pre-Schism" |
|---|
|
|---|
| Osman I | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Western Asia_2" |
|---|
|
|---|
| Otto the Great | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Holy Roman Empire" |
|---|
|
|---|
| Oda Nobunaga | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Japan" |
|---|
|
|---|
| Oliver Cromwell | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "England and Scotland_2" |
|---|
|
|---|
| Olusegun Obasanjo | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Western Africa" |
|---|
|
|---|
| Otto von Bismarck | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Germany_2" |
|---|
|
|---|
| Osama bin Laden | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Asia_9" |
|---|
|
|---|
| Otto Hahn | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Chemistry" |
|---|
|
|---|
| Ole Einar Bjørndalen | | level | 4 |
|---|
| topic | "People" |
|---|
| section | "Biathlon" |
|---|
|
|---|
| Occam's razor | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Concepts_2" |
|---|
|
|---|
| Opinion | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Concepts_2" |
|---|
|
|---|
| Origin myth | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Beliefs" |
|---|
|
|---|
| Orthodoxy | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Theistic philosophies" |
|---|
|
|---|
| Old Testament | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Common concepts" |
|---|
|
|---|
| Orthodox Judaism | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Judaism" |
|---|
|
|---|
| Oriental Orthodox Churches | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Branches" |
|---|
|
|---|
| Om | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Common concepts_2" |
|---|
|
|---|
| Old Norse religion | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Ancient religions" |
|---|
|
|---|
| Osiris | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Egyptian mythology" |
|---|
|
|---|
| Odysseus | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Greek mythological heroes" |
|---|
|
|---|
| Odin | | level | 4 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Norse mythology" |
|---|
|
|---|
| Observation | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Basics" |
|---|
|
|---|
| Ounce | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Mass" |
|---|
|
|---|
| Ohm | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Electromagnetism" |
|---|
|
|---|
| Observatory | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Observational astronomy" |
|---|
|
|---|
| Oort cloud | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Solar System" |
|---|
|
|---|
| Orion Nebula | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Notable nebulae" |
|---|
|
|---|
| Omega Centauri | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Other notable objects" |
|---|
|
|---|
| Orbital mechanics | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Orbital mechanics" |
|---|
|
|---|
| Orion (constellation) | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Constellations" |
|---|
|
|---|
| Observable universe | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Physical cosmology" |
|---|
|
|---|
| Organometallic chemistry | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemistry: General" |
|---|
|
|---|
| Ozone | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemical elements_2" |
|---|
|
|---|
| Osmium | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemical elements_2" |
|---|
|
|---|
| Organic compound | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Chemical compounds: General" |
|---|
|
|---|
| Oxide | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Inorganic compounds" |
|---|
|
|---|
| Organophosphorus chemistry | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Organic compounds" |
|---|
|
|---|
| Organosilicon chemistry | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Organic compounds" |
|---|
|
|---|
| Organosulfur chemistry | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Organic compounds" |
|---|
|
|---|
| Ore | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Petrology" |
|---|
|
|---|
| Oil shale | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Petrology" |
|---|
|
|---|
| Oasis | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Fluvial landforms" |
|---|
|
|---|
| Oceanic trench | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Oceanic and coastal landforms" |
|---|
|
|---|
| Ozone depletion | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Atmosphere" |
|---|
|
|---|
| Oceanography | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Ocean | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Ocean current | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Orange (colour) | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Color terms" |
|---|
|
|---|
| Oil drop experiment | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Basics_9" |
|---|
|
|---|
| Ohm's law | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Electrical circuits" |
|---|
|
|---|
| Oscillation | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Basics_10" |
|---|
|
|---|
| Osmosis | | level | 4 |
|---|
| topic | "Physical sciences" |
|---|
| section | "Fluid mechanics" |
|---|
|
|---|
| OECD | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Governmental organizations" |
|---|
|
|---|
| OPEC | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Governmental organizations" |
|---|
|
|---|
| Organization for Security and Co-operation in Europe | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Governmental organizations" |
|---|
|
|---|
| Organization of American States | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Governmental organizations" |
|---|
|
|---|
| Origin of language | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Basics_2" |
|---|
|
|---|
| Orthography | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Basics_2" |
|---|
|
|---|
| Old English | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Germanic languages" |
|---|
|
|---|
| Old Church Slavonic | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Slavic languages" |
|---|
|
|---|
| Odia language | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Indo-Aryan languages" |
|---|
|
|---|
| Oromo language | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Afroasiatic languages" |
|---|
|
|---|
| Organized crime | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Crime" |
|---|
|
|---|
| Opinion poll | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Politics" |
|---|
|
|---|
| Oligarchy | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Forms of government" |
|---|
|
|---|
| Oedipus complex | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Organization | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Groups" |
|---|
|
|---|
| Orphanage | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Services and institutions" |
|---|
|
|---|
| One-child policy | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Issues" |
|---|
|
|---|
| Officer (armed forces) | | level | 4 |
|---|
| topic | "Society and social sciences" |
|---|
| section | "Military ranks" |
|---|
|
|---|
| Orchard | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Forms" |
|---|
|
|---|
| Organic farming | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Forms" |
|---|
|
|---|
| Open-source software | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Computer software" |
|---|
|
|---|
| Operating system | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Operating systems" |
|---|
|
|---|
| Optical disc | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Data storage" |
|---|
|
|---|
| Object-oriented programming | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Programming" |
|---|
|
|---|
| Oscilloscope | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Basics_4" |
|---|
|
|---|
| Oil refinery | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Energy and fuel" |
|---|
|
|---|
| Oil well | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Energy and fuel" |
|---|
|
|---|
| Office | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Commercial buildings" |
|---|
|
|---|
| Optical fiber | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Basics_9" |
|---|
|
|---|
| Optical microscope | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Optical instruments" |
|---|
|
|---|
| Optical telescope | | level | 4 |
|---|
| topic | "Technology" |
|---|
| section | "Optical instruments" |
|---|
|
|---|
| Ostankino Tower | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Europe" |
|---|
|
|---|
| Oslo Opera House | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Europe" |
|---|
|
|---|
| Opera house | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Cultural venues" |
|---|
|
|---|
| On the Soul | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of antiquity" |
|---|
|
|---|
| Opticks | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Nonfiction of early printed book era" |
|---|
|
|---|
| Orientalism (book) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "General nonfiction" |
|---|
|
|---|
| Orthodoxy (book) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "General nonfiction" |
|---|
|
|---|
| Out of Africa | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Biographies and memoirs" |
|---|
|
|---|
| On Liberty | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Essays" |
|---|
|
|---|
| Oedipus at Colonus | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Fiction of antiquity" |
|---|
|
|---|
| Oblomov | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "19th century fiction" |
|---|
|
|---|
| Oliver Twist | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "19th century fiction" |
|---|
|
|---|
| Of Human Bondage | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Literary fiction" |
|---|
|
|---|
| Of Mice and Men | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Literary fiction" |
|---|
|
|---|
| One Flew Over the Cuckoo's Nest (novel) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Literary fiction" |
|---|
|
|---|
| Orlando: A Biography | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Historical fiction" |
|---|
|
|---|
| Outlander (novel) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Romance novels" |
|---|
|
|---|
| Odes (Horace) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of antiquity" |
|---|
|
|---|
| Olympian 1 | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of antiquity" |
|---|
|
|---|
| Orlando Furioso | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of early printed book era" |
|---|
|
|---|
| Os Lusíadas | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of early printed book era" |
|---|
|
|---|
| O Captain! My Captain! | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of modern era" |
|---|
|
|---|
| Omeros | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of modern era" |
|---|
|
|---|
| Ozymandias | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Poetic works of modern era" |
|---|
|
|---|
| Orchestration | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Basics_3" |
|---|
|
|---|
| Ornament (music) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Musical notation" |
|---|
|
|---|
| Oratorio | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Basic forms" |
|---|
|
|---|
| Overture | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Basic forms" |
|---|
|
|---|
| Ocarina | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Wind instruments" |
|---|
|
|---|
| O Tannenbaum | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Christmas carols" |
|---|
|
|---|
| Orpheus in the Underworld | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Opera" |
|---|
|
|---|
| Otello | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Opera" |
|---|
|
|---|
| Oklahoma! | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Musicals" |
|---|
|
|---|
| Ol' Man River | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Musicals" |
|---|
|
|---|
| O Canada | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Anthems and patriotic songs" |
|---|
|
|---|
| Oh! Susanna | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Folk" |
|---|
|
|---|
| OK Computer | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Rock_2" |
|---|
|
|---|
| Over the Rainbow | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Film, television and video game music" |
|---|
|
|---|
| Operetta | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Musical theatre" |
|---|
|
|---|
| Ottonian art | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Medieval art" |
|---|
|
|---|
| Op art | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Modern art" |
|---|
|
|---|
| Orientalism | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Modern art" |
|---|
|
|---|
| Oceanian art | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Non-Western art traditions" |
|---|
|
|---|
| Obelisk | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Sculpture" |
|---|
|
|---|
| Olympia (Manet) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Modern" |
|---|
|
|---|
| Ophelia (painting) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Modern" |
|---|
|
|---|
| Oldboy (2003 film) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Action" |
|---|
|
|---|
| Ordet | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Art film" |
|---|
|
|---|
| Olympia (1938 film) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Documentary" |
|---|
|
|---|
| On the Waterfront | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Drama film" |
|---|
|
|---|
| One Flew Over the Cuckoo's Nest (film) | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Drama film" |
|---|
|
|---|
| Once Upon a Time in the West | | level | 5 |
|---|
| topic | "Arts" |
|---|
| section | "Western" |
|---|
|
|---|
| Oriental Shorthair | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Cats" |
|---|
|
|---|
| Oxyaenidae | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Mammals: General" |
|---|
|
|---|
| Ocelot | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Felines" |
|---|
|
|---|
| Oryx | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Bovidae" |
|---|
|
|---|
| Odobenocetops | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Cetaceans" |
|---|
|
|---|
| Oceanic dolphin | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Toothed whale" |
|---|
|
|---|
| Okapi | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Giraffidae" |
|---|
|
|---|
| Onager | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Equidae" |
|---|
|
|---|
| Octodon | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Rodents" |
|---|
|
|---|
| Old World porcupine | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Rodents" |
|---|
|
|---|
| Oriental giant squirrel | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Rodents" |
|---|
|
|---|
| Oilbird | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Caprimulgiformes and related" |
|---|
|
|---|
| Owlet-nightjar | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Caprimulgiformes and related" |
|---|
|
|---|
| Oystercatcher | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Charadriiformes" |
|---|
|
|---|
| Oriental pied hornbill | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Coraciiformes" |
|---|
|
|---|
| Ocellated turkey | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Galliformes" |
|---|
|
|---|
| Old World quail | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Quails" |
|---|
|
|---|
| Old World oriole | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Passerida" |
|---|
|
|---|
| Oxpecker | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Passerida" |
|---|
|
|---|
| Old World warbler | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Passerida" |
|---|
|
|---|
| Oriental garden lizard | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Iguania" |
|---|
|
|---|
| Ornithischia | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Ornitischians" |
|---|
|
|---|
| Ornithopoda | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Ornitischians" |
|---|
|
|---|
| Ornithomimosauria | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Theropods" |
|---|
|
|---|
| Ornithomimus | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Theropods" |
|---|
|
|---|
| Oviraptor | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Theropods" |
|---|
|
|---|
| Ornithocheirus | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Pterosaurs" |
|---|
|
|---|
| Ophthalmosaurus | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Prehistoric marine reptiles" |
|---|
|
|---|
| Olm | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Salamanders and newts" |
|---|
|
|---|
| Opah | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Lampriformes" |
|---|
|
|---|
| Osteoglossiformes | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Osteoglossiformes" |
|---|
|
|---|
| Oncorhynchus | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Salmoniformes" |
|---|
|
|---|
| Ostraciidae | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Tetraodontiformes" |
|---|
|
|---|
| Osteolepis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Prehistoric osteichthyans" |
|---|
|
|---|
| Opiliones | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Arachnids" |
|---|
|
|---|
| Orb-weaver spider | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Spiders" |
|---|
|
|---|
| Oriental rat flea | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Insects: General" |
|---|
|
|---|
| Ochetellus glaber | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Hymenoptera" |
|---|
|
|---|
| Opabinia | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Fossil arthropods" |
|---|
|
|---|
| Orthoceras | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Cephalopods" |
|---|
|
|---|
| Onychophora | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Ecdysozoa" |
|---|
|
|---|
| Orthonectida | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Spiralia" |
|---|
|
|---|
| Oligochaeta | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Lophotrochozoa" |
|---|
|
|---|
| Ottoia | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Animals" |
|---|
| section | "Lophotrochozoa" |
|---|
|
|---|
| Organic matter | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Biology basics" |
|---|
|
|---|
| Order (biology) | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Biology basics" |
|---|
|
|---|
| Organ system | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Basic anatomy" |
|---|
|
|---|
| Occipital lobe | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Nervous system" |
|---|
|
|---|
| Ossicles | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Nervous system" |
|---|
|
|---|
| Optic nerve | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Nervous system" |
|---|
|
|---|
| Osmoregulation | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Basics" |
|---|
|
|---|
| Oogenesis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Animal reproduction" |
|---|
|
|---|
| Ovulation | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Human reproduction" |
|---|
|
|---|
| Oogonium | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Plant reproduction" |
|---|
|
|---|
| Omega-3 fatty acid | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Lipids" |
|---|
|
|---|
| Omega-6 fatty acid | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Lipids" |
|---|
|
|---|
| Operon | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Molecular biology" |
|---|
|
|---|
| Ornithology | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Basics_2" |
|---|
|
|---|
| Omnivore | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Ethology" |
|---|
|
|---|
| Oxidative phosphorylation | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Cell processes" |
|---|
|
|---|
| Orrorin | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Biology" |
|---|
| section | "Australopithecines" |
|---|
|
|---|
| Operating theater | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Health facilities" |
|---|
|
|---|
| Orthopedic cast | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Treatments" |
|---|
|
|---|
| Oxygen therapy | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Treatments" |
|---|
|
|---|
| Occupational therapy | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Therapy" |
|---|
|
|---|
| Oral rehydration therapy | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Therapy" |
|---|
|
|---|
| Osteopathy | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Orthodontics | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Occupational medicine | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Orthopedic surgery | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Orthotics | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Obstetrics | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fields of medicine" |
|---|
|
|---|
| Oral administration | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "General concepts_2" |
|---|
|
|---|
| Oseltamivir | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Antiviral drugs" |
|---|
|
|---|
| Opioid | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Pain treatments" |
|---|
|
|---|
| Oxycodone | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Pain treatments" |
|---|
|
|---|
| Osteoarthritis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Disease" |
|---|
|
|---|
| Osteoporosis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Disease" |
|---|
|
|---|
| Open fracture | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Types" |
|---|
|
|---|
| Obstructive shock | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Types" |
|---|
|
|---|
| Opportunistic infection | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Otitis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Otitis externa | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Otitis media | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Orthomyxoviridae | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Specific viruses" |
|---|
|
|---|
| Onychomycosis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Fungal infections" |
|---|
|
|---|
| Onchocerciasis | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Parasitic infections" |
|---|
|
|---|
| Obsessive–compulsive disorder | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Mental disorders" |
|---|
|
|---|
| Oppositional defiant disorder | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Mental disorders" |
|---|
|
|---|
| Obsessive–compulsive personality disorder | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Health" |
|---|
| section | "Mental disorders" |
|---|
|
|---|
| Ophioglossidae | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Ferns" |
|---|
|
|---|
| Old Tjikko | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Pinophyta (Conifers)" |
|---|
|
|---|
| Oryza | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Poales" |
|---|
|
|---|
| Opuntia | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Other culinary fruits" |
|---|
|
|---|
| Oryza glaberrima | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Grains" |
|---|
|
|---|
| Ocimum tenuiflorum | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Herbs and spices" |
|---|
|
|---|
| Oregano | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Herbs and spices" |
|---|
|
|---|
| Oakmoss | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Lichens" |
|---|
|
|---|
| Opisthokont | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Eukaryotes" |
|---|
|
|---|
| Oomycete | | level | 5 |
|---|
| topic | "Biology and health sciences" |
|---|
| sublist | "Plants" |
|---|
| section | "Chromalveolata" |
|---|
|
|---|
| One-piece swimsuit | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Clothes: General" |
|---|
|
|---|
| Overcoat | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Outerwear" |
|---|
|
|---|
| Olive oil | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Cooking oils" |
|---|
|
|---|
| Omelette | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Meat and other animal products" |
|---|
|
|---|
| Octopus as food | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Seafood" |
|---|
|
|---|
| Oat milk | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Dairy analogues" |
|---|
|
|---|
| Oyster sauce | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Specific" |
|---|
|
|---|
| Onion ring | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Food types" |
|---|
|
|---|
| Okonomiyaki | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Food types" |
|---|
|
|---|
| Oladyi | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Food types" |
|---|
|
|---|
| Oatmeal | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Food types" |
|---|
|
|---|
| Orange juice | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Cold drinks" |
|---|
|
|---|
| Oolong | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Hot drinks" |
|---|
|
|---|
| Only child | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "First-degree relatives" |
|---|
|
|---|
| Ottoman (furniture) | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Furniture and interior design" |
|---|
|
|---|
| Owner's manual | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Furniture and interior design" |
|---|
|
|---|
| One-night stand | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| section | "Sexuality and gender" |
|---|
|
|---|
| Obstacle course | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "Recreation and tourism" |
|---|
|
|---|
| Outdoor recreation | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "Recreation and tourism" |
|---|
|
|---|
| Open world | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "General video game topics" |
|---|
|
|---|
| Online game | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "General video game topics" |
|---|
|
|---|
| One Day International | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "Team sports" |
|---|
|
|---|
| Off-road racing | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "Motor racing" |
|---|
|
|---|
| Offshore powerboat racing | | level | 5 |
|---|
| topic | "Everyday life" |
|---|
| sublist | "Sports, games and recreation" |
|---|
| section | "Powerboat racing" |
|---|
|
|---|
| Oujda | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Morocco" |
|---|
|
|---|
| Osogbo | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Owerri | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Oyo, Oyo State | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Orlando, Florida | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "South" |
|---|
|
|---|
| Oklahoma City | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "South" |
|---|
|
|---|
| Omaha, Nebraska | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Midwest" |
|---|
|
|---|
| Oakland, California | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "West" |
|---|
|
|---|
| Olympia, Washington | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "West" |
|---|
|
|---|
| Oaxaca City | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Mexico" |
|---|
|
|---|
| Oruro | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Bolivia" |
|---|
|
|---|
| Oral, Kazakhstan | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Kazakhstan" |
|---|
|
|---|
| Oskemen | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Kazakhstan" |
|---|
|
|---|
| Osh | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Kyrgyzstan" |
|---|
|
|---|
| Okazaki, Aichi | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Chūbu" |
|---|
|
|---|
| Okayama | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Chūgoku" |
|---|
|
|---|
| Okara, Pakistan | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Pakistan" |
|---|
|
|---|
| Olongapo | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Luzon" |
|---|
|
|---|
| Old City of Jerusalem | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Israel" |
|---|
|
|---|
| Ostrava | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Czech Republic" |
|---|
|
|---|
| Olsztyn | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Poland" |
|---|
|
|---|
| Orenburg | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Volga" |
|---|
|
|---|
| Odense | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Denmark" |
|---|
|
|---|
| Oulu | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Finland" |
|---|
|
|---|
| Orléans | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "France" |
|---|
|
|---|
| Oberhausen | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Germany" |
|---|
|
|---|
| Oxford | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "England" |
|---|
|
|---|
| Oviedo | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Cities" |
|---|
| section | "Spain" |
|---|
|
|---|
| Oromia | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Ethiopia" |
|---|
|
|---|
| Ogun State | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Ondo State | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Osun State | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Oyo State | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Nigeria" |
|---|
|
|---|
| Orient | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Asia: General" |
|---|
|
|---|
| Odisha | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "India" |
|---|
|
|---|
| Okayama Prefecture | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Japan" |
|---|
|
|---|
| Osaka Prefecture | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Japan" |
|---|
|
|---|
| Okinawa Prefecture | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Japan" |
|---|
|
|---|
| Overseas France | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "France" |
|---|
|
|---|
| Occitania | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "France" |
|---|
|
|---|
| Overijssel | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Netherlands" |
|---|
|
|---|
| Opole Voivodeship | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Poland" |
|---|
|
|---|
| Obwalden | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Switzerland" |
|---|
|
|---|
| Oblasts of Ukraine | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Ukraine" |
|---|
|
|---|
| Odesa Oblast | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Ukraine" |
|---|
|
|---|
| Oxfordshire | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "United Kingdom" |
|---|
|
|---|
| Oaxaca | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Mexico" |
|---|
|
|---|
| Oklahoma | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "United States" |
|---|
|
|---|
| Ohio | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "United States" |
|---|
|
|---|
| Oregon | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "United States" |
|---|
|
|---|
| Otago | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "New Zealand" |
|---|
|
|---|
| O'Higgins Region | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Countries" |
|---|
| section | "Chile" |
|---|
|
|---|
| Ogooué River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Okavango River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Omo River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Oum Er-Rbia River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Orontes River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Western Asia" |
|---|
|
|---|
| Oder | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Europe_3" |
|---|
|
|---|
| Oka (river) | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Europe_3" |
|---|
|
|---|
| Ottawa River | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Canada" |
|---|
|
|---|
| Oder–Havel Canal | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Canals" |
|---|
|
|---|
| Ogallala Aquifer | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Aquifers" |
|---|
|
|---|
| Old Faithful | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Geysers and hot springs" |
|---|
|
|---|
| Okavango Delta | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "River deltas" |
|---|
|
|---|
| Okinawa Island | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Japan" |
|---|
|
|---|
| October Revolution Island | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Arctic" |
|---|
|
|---|
| Outer Hebrides | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "British Isles" |
|---|
|
|---|
| Orkney | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "British Isles" |
|---|
|
|---|
| Ometepe | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "North and Central America: General" |
|---|
|
|---|
| Outer Banks | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Oahu | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Oceania_3" |
|---|
|
|---|
| Ontong Java Atoll | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Oceania_3" |
|---|
|
|---|
| Olympic Peninsula | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Americas_2" |
|---|
|
|---|
| Oga Peninsula | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Asia_5" |
|---|
|
|---|
| Oshima Peninsula | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Asia_5" |
|---|
|
|---|
| Ozarks | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "North America_3" |
|---|
|
|---|
| Olympic Mountains | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "North America_3" |
|---|
|
|---|
| Ordesa Valley | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Europe_6" |
|---|
|
|---|
| Ojos del Salado | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "South America_5" |
|---|
|
|---|
| Optymistychna Cave | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Caves" |
|---|
|
|---|
| Old Man of Hoy | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Cliffs, headlands, stacks and natural arches" |
|---|
|
|---|
| Okapi Wildlife Reserve | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "Africa_8" |
|---|
|
|---|
| Olympic National Park | | level | 5 |
|---|
| topic | "Geography" |
|---|
| sublist | "Physical" |
|---|
| section | "North America_4" |
|---|
|
|---|
| Oral history | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Basics: General" |
|---|
|
|---|
| Ostia Antica | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Europe_3" |
|---|
|
|---|
| Overthrow of the Roman monarchy | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Europe_4" |
|---|
|
|---|
| Ostrogoths | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Europe_4" |
|---|
|
|---|
| Ottonian dynasty | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Europe" |
|---|
|
|---|
| Old Prussians | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Europe" |
|---|
|
|---|
| Ostrogothic Kingdom | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Italy" |
|---|
|
|---|
| Order of Assassins | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Asia_2" |
|---|
|
|---|
| Ottoman–Mamluk War (1516–1517) | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Asia_2" |
|---|
|
|---|
| Ottoman–Persian Wars | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Asia_2" |
|---|
|
|---|
| Oddiyana | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Central Asia and Iran" |
|---|
|
|---|
| Old Swiss Confederacy | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Europe_2" |
|---|
|
|---|
| Oprichnina | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Eastern Europe and Central" |
|---|
|
|---|
| Oromo expansion | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Africa_6" |
|---|
|
|---|
| Ottoman Tripolitania | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Africa_6" |
|---|
|
|---|
| Oudh State | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Southern Asia_3" |
|---|
|
|---|
| Ottoman entry into World War I | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War I" |
|---|
|
|---|
| Operation Barbarossa | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Operation Bagration | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Operation Reinhard | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Operation Torch | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Oder–Neisse line | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Operation Market Garden | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Operation Weserübung | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "World War II" |
|---|
|
|---|
| Occupation of the Baltic states | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Europe_7" |
|---|
|
|---|
| October Revolution | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Europe_7" |
|---|
|
|---|
| Oregon boundary dispute | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Oregon Trail | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Origins of the American Civil War | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "American Civil War" |
|---|
|
|---|
| Overland Campaign | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Battles" |
|---|
|
|---|
| Orange Free State | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Africa_7" |
|---|
|
|---|
| Omani Empire | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Western Asia_3" |
|---|
|
|---|
| Overthrow of the Hawaiian Kingdom | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Oceania_7" |
|---|
|
|---|
| Occupy movement | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Contemporary history: General" |
|---|
|
|---|
| Occupation of Japan | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Contemporary history: General" |
|---|
|
|---|
| Operation Enduring Freedom – Philippines | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Contemporary history: General" |
|---|
|
|---|
| Ogaden War | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Africa_8" |
|---|
|
|---|
| Operation Linda Nchi | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Africa_8" |
|---|
|
|---|
| Operation Uphold Democracy | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "North America_3" |
|---|
|
|---|
| Occupy Wall Street | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "United States_3" |
|---|
|
|---|
| Oklahoma City bombing | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "United States_3" |
|---|
|
|---|
| Operation Car Wash | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "South America_3" |
|---|
|
|---|
| One country, two systems | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "China" |
|---|
|
|---|
| Occupation of the Gaza Strip by the United Arab Republic | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "West Asia" |
|---|
|
|---|
| Orange Revolution | | level | 5 |
|---|
| topic | "History" |
|---|
| section | "Eastern Europe" |
|---|
|
|---|
| One half | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Basics" |
|---|
|
|---|
| Operation (mathematics) | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Basics" |
|---|
|
|---|
| One-dimensional space | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Geometry: General" |
|---|
|
|---|
| Octagon | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Two-dimensional space" |
|---|
|
|---|
| Octahedron | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Three-dimensional space" |
|---|
|
|---|
| Orientability | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Topology" |
|---|
|
|---|
| Operator theory | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Linear algebra" |
|---|
|
|---|
| Operator (mathematics) | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Linear algebra" |
|---|
|
|---|
| Outcome (probability) | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Probability" |
|---|
|
|---|
| Ordered pair | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Set theory" |
|---|
|
|---|
| Ordinal number | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Set theory" |
|---|
|
|---|
| Oracle machine | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Computability theory" |
|---|
|
|---|
| Opposite category | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Category theory" |
|---|
|
|---|
| Order theory | | level | 5 |
|---|
| topic | "Mathematics" |
|---|
| section | "Order theory" |
|---|
|
|---|
| Otto Dix | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Late modern era" |
|---|
|
|---|
| Odilon Redon | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Late modern era" |
|---|
|
|---|
| Ossip Zadkine | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Sculptors" |
|---|
|
|---|
| Otto Wagner | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Architects" |
|---|
|
|---|
| Ole Kirk Christiansen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Board game and toy designers" |
|---|
|
|---|
| Orry-Kelly | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Fashion" |
|---|
|
|---|
| Oscar de la Renta | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Fashion" |
|---|
|
|---|
| Olafur Eliasson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Contemporary art: General" |
|---|
|
|---|
| Ogata Kenzan | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Pottery" |
|---|
|
|---|
| Orville Gibson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Instrument makers" |
|---|
|
|---|
| Osman Waqialla | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "African" |
|---|
|
|---|
| Ouyang Xun | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Chinese" |
|---|
|
|---|
| Ogata Kōrin | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Japanese" |
|---|
|
|---|
| Orlando di Lasso | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Medieval and Renaissance" |
|---|
|
|---|
| Orlando Gibbons | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Baroque" |
|---|
|
|---|
| Oliver Knussen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "20th century modern" |
|---|
|
|---|
| Olivier Messiaen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "20th century modern" |
|---|
|
|---|
| Ottorino Respighi | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "20th century modern" |
|---|
|
|---|
| Otto Klemperer | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Conductors" |
|---|
|
|---|
| Ornette Coleman | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Jazz and related genres" |
|---|
|
|---|
| Original Dixieland Jass Band | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Jazz and related genres" |
|---|
|
|---|
| Oscar Peterson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Jazz and related genres" |
|---|
|
|---|
| Olivia Newton-John | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Popular music: General" |
|---|
|
|---|
| One Direction | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Popular music: General" |
|---|
|
|---|
| Odetta | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Folk" |
|---|
|
|---|
| Ofra Haza | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Hebrew" |
|---|
|
|---|
| O-Zone | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Romanian & Moldavian" |
|---|
|
|---|
| Oliver Mtukudzi | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "African popular music" |
|---|
|
|---|
| Oumou Sangaré | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "African popular music" |
|---|
|
|---|
| Otis Redding | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Blues, R&B, Funk, Zydeco and Soul" |
|---|
|
|---|
| Oasis (band) | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Alternative rock" |
|---|
|
|---|
| Ozzy Osbourne | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Heavy metal and hard rock" |
|---|
|
|---|
| Outkast | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Hip-hop and rap" |
|---|
|
|---|
| O. P. Nayyar | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Artists, musicians, and composers" |
|---|
| section | "Musical theatre and film" |
|---|
|
|---|
| Omar Sharif | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Africa" |
|---|
|
|---|
| OC Ukeje | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Africa" |
|---|
|
|---|
| Ossie Davis | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States" |
|---|
|
|---|
| Omar Sy | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Europe" |
|---|
|
|---|
| Oleg Yankovsky | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Europe" |
|---|
|
|---|
| Omotola Jalade Ekeinde | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Africa_2" |
|---|
|
|---|
| Olympia Dukakis | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Olivia de Havilland | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Octavia Spencer | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Olive Thomas | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Olga Chekhova | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Europe_2" |
|---|
|
|---|
| Olivia Colman | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Europe_2" |
|---|
|
|---|
| Oumarou Ganda | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Otto Preminger | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_3" |
|---|
|
|---|
| Oliver Stone | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "United States_3" |
|---|
|
|---|
| Olga Spessivtseva | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Ballet" |
|---|
|
|---|
| Oliver Hardy | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Film_4" |
|---|
|
|---|
| Oleg Popov | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Entertainers, directors, producers, and screenwriters" |
|---|
| section | "Circus" |
|---|
|
|---|
| Oliver Hazard Perry | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "United States" |
|---|
|
|---|
| Omar Bradley | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Oliver North | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Otto Carius | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "Germany" |
|---|
|
|---|
| Otto Skorzeny | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "Germany" |
|---|
|
|---|
| Olympe de Gouges | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "France_3" |
|---|
|
|---|
| Oskar Schindler | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Military personnel, revolutionaries, and activists" |
|---|
| section | "Europe_3" |
|---|
|
|---|
| Oscar F. Mayer | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Food and drink" |
|---|
|
|---|
| Owen D. Young | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Media and communication" |
|---|
|
|---|
| Oliver Chace | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Other" |
|---|
|
|---|
| Oskar Dirlewanger | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Crimes against humanity" |
|---|
|
|---|
| Odilo Globocnik | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Crimes against humanity" |
|---|
|
|---|
| Otto Ohlendorf | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Crimes against humanity" |
|---|
|
|---|
| Oleg Nikolaenko | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Computer crimes" |
|---|
|
|---|
| Osiel Cárdenas Guillén | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Drugs" |
|---|
|
|---|
| Omar Mateen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Terrorism" |
|---|
|
|---|
| Ota Benga | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Case studies" |
|---|
|
|---|
| Otto Warmbier | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Miscellaneous" |
|---|
| section | "Other_3" |
|---|
|
|---|
| Otto Neurath | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Europe" |
|---|
|
|---|
| Oswald Spengler | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Europe" |
|---|
|
|---|
| Olivier Blanchard | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Economists and business theorists" |
|---|
|
|---|
| Oliver Hart (economist) | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Economists and business theorists" |
|---|
|
|---|
| Oliver E. Williamson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Economists and business theorists" |
|---|
|
|---|
| Otto Jespersen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Linguists" |
|---|
|
|---|
| O. G. S. Crawford | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Anthropologists and archaeologists" |
|---|
|
|---|
| Otto Kallir | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Art historians, theorists and critics" |
|---|
|
|---|
| Oscar Browning | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Educators" |
|---|
|
|---|
| Oronce Fine | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Human geographers and cartographers" |
|---|
|
|---|
| Oliver Wendell Holmes Jr. | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "United States" |
|---|
|
|---|
| Otto Rank | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Philosophers, historians, political and social scientists" |
|---|
| section | "Psychologists" |
|---|
|
|---|
| Osorkon I | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Egypt" |
|---|
|
|---|
| Onjo of Baekje | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Korea" |
|---|
|
|---|
| Olympias | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Macedonia" |
|---|
|
|---|
| Odoacer | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Western Europe" |
|---|
|
|---|
| Otho | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Roman Emperors" |
|---|
|
|---|
| Offa of Mercia | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "British Isles" |
|---|
|
|---|
| Owain Glyndŵr | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Wales" |
|---|
|
|---|
| Otto II, Holy Roman Emperor | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Holy Roman Empire" |
|---|
|
|---|
| Otto III, Holy Roman Emperor | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Holy Roman Empire" |
|---|
|
|---|
| Otto IV, Holy Roman Emperor | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Holy Roman Empire" |
|---|
|
|---|
| Olaf II of Norway | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Scandinavia" |
|---|
|
|---|
| Ordoño II of León | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Iberia" |
|---|
|
|---|
| Oleg the Wise | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Russia and Ukraine" |
|---|
|
|---|
| Olga of Kiev | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Russia and Ukraine" |
|---|
|
|---|
| Osei Kofi Tutu I | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Africa_3" |
|---|
|
|---|
| Ovonramwen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "West Africa" |
|---|
|
|---|
| Omar Saidou Tall | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "West Africa" |
|---|
|
|---|
| Oguri Kozukenosuke | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Other_5" |
|---|
|
|---|
| Otto Strasser | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Nazi Germany" |
|---|
|
|---|
| Oswald Mosley | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Other_7" |
|---|
|
|---|
| Omar al-Bashir | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Sudan" |
|---|
|
|---|
| Omar Bongo | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Central Africa" |
|---|
|
|---|
| Oswaldo López Arellano | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Honduras_2" |
|---|
|
|---|
| Omar Torrijos | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Panama_2" |
|---|
|
|---|
| Owen Arthur | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Barbados" |
|---|
|
|---|
| Omar Ali Saifuddien III | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Brunei" |
|---|
|
|---|
| Olaf Scholz | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Unified Germany" |
|---|
|
|---|
| Olof Palme | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Politicians and leaders" |
|---|
| section | "Scandinavia_4" |
|---|
|
|---|
| Ovadia Yosef | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Religious figures" |
|---|
| section | "Judaism" |
|---|
|
|---|
| Oral Roberts | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Religious figures" |
|---|
| section | "Late modern and contemporary, 1800-present" |
|---|
|
|---|
| Otto von Guericke | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Early modern" |
|---|
|
|---|
| Owen Chamberlain | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern" |
|---|
|
|---|
| Oliver Lodge | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern" |
|---|
|
|---|
| Osborne Reynolds | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern" |
|---|
|
|---|
| Owen Willans Richardson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern" |
|---|
|
|---|
| Otto Stern | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern" |
|---|
|
|---|
| Othniel Charles Marsh | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Biology" |
|---|
|
|---|
| Oliver Sacks | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Medicine" |
|---|
|
|---|
| Otto Heinrich Warburg | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Medicine" |
|---|
|
|---|
| Ole Worm | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Medicine" |
|---|
|
|---|
| Ottomar Anschütz | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Inventors and engineers" |
|---|
|
|---|
| Octave Chanute | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Inventors and engineers" |
|---|
|
|---|
| Oliver Heaviside | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Inventors and engineers" |
|---|
|
|---|
| Otto Lilienthal | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Inventors and engineers" |
|---|
|
|---|
| Oliver Winchester | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Inventors and engineers" |
|---|
|
|---|
| Olga Gil Medrano | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern_2" |
|---|
|
|---|
| Oswald Veblen | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Scientists, inventors, and mathematicians" |
|---|
| section | "Late modern_2" |
|---|
|
|---|
| Oleg Blokhin | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "European" |
|---|
|
|---|
| Oscar Robertson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Guards" |
|---|
|
|---|
| Oscar Schmidt | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Non-U.S. men" |
|---|
|
|---|
| Otto Graham | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Quarterbacks" |
|---|
|
|---|
| O. J. Simpson | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Running backs" |
|---|
|
|---|
| Old Tom Morris | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Golf" |
|---|
|
|---|
| Oscar Pistorius | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Athletics" |
|---|
|
|---|
| Oscar De La Hoya | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Boxing" |
|---|
|
|---|
| Olga Korbut | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Gymnastics" |
|---|
|
|---|
| Olga Brusnikina | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Swimming" |
|---|
|
|---|
| Oliver Lang | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Sports figures" |
|---|
| section | "Paintball" |
|---|
|
|---|
| Oliver Goldsmith | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Europe_3" |
|---|
|
|---|
| Octavia E. Butler | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "US and Canada" |
|---|
|
|---|
| Orson Scott Card | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "US and Canada" |
|---|
|
|---|
| O. Henry | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "US and Canada" |
|---|
|
|---|
| Ozaki Kōyō | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Asia_4" |
|---|
|
|---|
| Odysseas Elytis | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Eastern Europe" |
|---|
|
|---|
| Olga Tokarczuk | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Eastern Europe" |
|---|
|
|---|
| Octave Mirbeau | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Western Europe" |
|---|
|
|---|
| Osbert Sitwell | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "UK and Ireland" |
|---|
|
|---|
| Olaf Stapledon | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "UK and Ireland" |
|---|
|
|---|
| Ono no Komachi | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Asia_6" |
|---|
|
|---|
| Oliver Wendell Holmes Sr. | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "US and Canada_2" |
|---|
|
|---|
| Ogden Nash | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "US and Canada_2" |
|---|
|
|---|
| Oswald de Andrade | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Latin America_2" |
|---|
|
|---|
| Olavo Bilac | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Latin America_2" |
|---|
|
|---|
| Octavio Paz | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Latin America_2" |
|---|
|
|---|
| Oton Župančič | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Eastern Europe_2" |
|---|
|
|---|
| Olga Bergholz | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Russia_2" |
|---|
|
|---|
| Osip Mandelstam | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Russia_2" |
|---|
|
|---|
| Oodgeroo Noonuccal | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Oceania_3" |
|---|
|
|---|
| Ottavio Rinuccini | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Librettists" |
|---|
|
|---|
| Oriana Fallaci | | level | 5 |
|---|
| topic | "People" |
|---|
| sublist | "Writers and journalists" |
|---|
| section | "Journalists: General" |
|---|
|
|---|
| Other (philosophy) | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Concepts_3" |
|---|
|
|---|
| Ontological argument | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Religious philosophy" |
|---|
|
|---|
| Objectivism | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Philosophical schools and traditions" |
|---|
|
|---|
| Occult | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Basics_2" |
|---|
|
|---|
| Oracle | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Practices" |
|---|
|
|---|
| Original sin | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Theology" |
|---|
|
|---|
| Order of Saint Augustine | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Practices_2" |
|---|
|
|---|
| Order of Saint John (Bailiwick of Brandenburg) | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Practices_2" |
|---|
|
|---|
| Ora et labora | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Practices_2" |
|---|
|
|---|
| Oral Torah | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Judaism" |
|---|
|
|---|
| Odinala | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Other religions: General" |
|---|
|
|---|
| Oedipus | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Greek mythological people" |
|---|
|
|---|
| Ophanim | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Legendary creatures" |
|---|
|
|---|
| Ogre | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Legendary creatures" |
|---|
|
|---|
| Orion (mythology) | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Legendary creatures" |
|---|
|
|---|
| Oni | | level | 5 |
|---|
| topic | "Philosophy and religion" |
|---|
| section | "Legendary creatures" |
|---|
|
|---|
| Origin of the Moon | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Solar System" |
|---|
|
|---|
| Orbit of the Moon | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Solar System" |
|---|
|
|---|
| Olympus Mons | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Solar System" |
|---|
|
|---|
| Oberon (moon) | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Solar System" |
|---|
|
|---|
| Orion Arm | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Milky Way" |
|---|
|
|---|
| Omega Nebula | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Notable nebulae" |
|---|
|
|---|
| Orbital eccentricity | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Celestial mechanics" |
|---|
|
|---|
| Orbital elements | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Celestial mechanics" |
|---|
|
|---|
| Orbital inclination | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Celestial mechanics" |
|---|
|
|---|
| Orbital resonance | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Orbital mechanics" |
|---|
|
|---|
| Orbital station-keeping | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Orbital mechanics" |
|---|
|
|---|
| Oberth effect | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Orbital mechanics" |
|---|
|
|---|
| Orion's Belt | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Asterism" |
|---|
|
|---|
| Octans | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Other" |
|---|
|
|---|
| Ophiuchus | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Other" |
|---|
|
|---|
| Open cluster | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Stellar astronomy" |
|---|
|
|---|
| Observational cosmology | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Astronomy" |
|---|
| section | "Physical cosmology" |
|---|
|
|---|
| Open science | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Basics and measurement" |
|---|
| section | "Science basics" |
|---|
|
|---|
| Oxgang | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Basics and measurement" |
|---|
| section | "Area" |
|---|
|
|---|
| Olympiad | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Basics and measurement" |
|---|
| section | "Time" |
|---|
|
|---|
| Octet rule | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Bonding" |
|---|
|
|---|
| Open-chain compound | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Substance" |
|---|
|
|---|
| Octasulfur | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Group 16" |
|---|
|
|---|
| Oganesson | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Group 18" |
|---|
|
|---|
| Organic acid | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Specific acids" |
|---|
|
|---|
| Oxalic acid | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Specific acids" |
|---|
|
|---|
| Oxygen difluoride | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Covalent oxides" |
|---|
|
|---|
| Oil | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Hydrocarbons" |
|---|
|
|---|
| Octane rating | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Hydrocarbons" |
|---|
|
|---|
| Organochlorine chemistry | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Halocarbons" |
|---|
|
|---|
| Oligomer | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Polymers" |
|---|
|
|---|
| Osmium tetroxide | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Oxide salts" |
|---|
|
|---|
| Oxyanion | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Oxyanionic salts" |
|---|
|
|---|
| Organic reaction | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Organic reactions" |
|---|
|
|---|
| Olefin metathesis | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Organic reactions" |
|---|
|
|---|
| Oxidation state | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Redox reactions" |
|---|
|
|---|
| Oxidizing agent | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Redox reactions" |
|---|
|
|---|
| One-pot synthesis | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Synthetic strategies" |
|---|
|
|---|
| Organic synthesis | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Synthetic strategies" |
|---|
|
|---|
| Octahedral molecular geometry | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Bond structure" |
|---|
|
|---|
| Orbital hybridisation | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Bond structure" |
|---|
|
|---|
| Osmotic pressure | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Chemistry" |
|---|
| section | "Thermodynamics" |
|---|
|
|---|
| Oxygen cycle | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Earth science basics: General" |
|---|
|
|---|
| Overexploitation | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Earth science basics: General" |
|---|
|
|---|
| Overfishing | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Earth science basics: General" |
|---|
|
|---|
| Outgoing longwave radiation | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Climate change" |
|---|
|
|---|
| Ocean acidification | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Climate change" |
|---|
|
|---|
| Ozone layer | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Atmosphere: General" |
|---|
|
|---|
| Organic geochemistry | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Geochemistry" |
|---|
|
|---|
| Ordovician | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Geological timescale" |
|---|
|
|---|
| Oligocene | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Geological timescale" |
|---|
|
|---|
| Ochre | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Oxide mineral | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Olivine | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Opal | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Onyx | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Orthoclase | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Orpiment | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Minerals" |
|---|
|
|---|
| Obsidian | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Petrology" |
|---|
|
|---|
| Oolite | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Petrology" |
|---|
|
|---|
| Orogeny | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Tectonics" |
|---|
|
|---|
| Oceanic crust | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Tectonics" |
|---|
|
|---|
| Okhotsk microplate | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Tectonic plates" |
|---|
|
|---|
| Oceanic basin | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanic and coastal landforms" |
|---|
|
|---|
| Ocean surface ecosystem | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Ocean dynamics | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Ocean surface topography | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Ocean temperature | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Oceanic zone | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Oceanography" |
|---|
|
|---|
| Oxbow lake | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Earth science" |
|---|
| section | "Hydrology" |
|---|
|
|---|
| Outline of physics | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Physics basics: General" |
|---|
|
|---|
| Onium | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Atomic physics" |
|---|
|
|---|
| Oxonium ion | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Atomic physics" |
|---|
|
|---|
| Optical pumping | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Atomic physics" |
|---|
|
|---|
| Optical path | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Optical path length | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Opacity (optics) | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Optical depth | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Optical power | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Optical coating | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Optics" |
|---|
|
|---|
| Olive (color) | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Colors" |
|---|
|
|---|
| Orthorhombic crystal system | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Crystallography" |
|---|
|
|---|
| Ohmic contact | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Electrical circuits" |
|---|
|
|---|
| Observable | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Quantum mechanics" |
|---|
|
|---|
| Operator (physics) | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Quantum mechanics" |
|---|
|
|---|
| Otto cycle | | level | 5 |
|---|
| topic | "Physical sciences" |
|---|
| sublist | "Physics" |
|---|
| section | "Thermodynamics" |
|---|
|
|---|
| Organizational communication | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Communication" |
|---|
|
|---|
| Old World | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Geocultural area" |
|---|
|
|---|
| Oktoberfest | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Festivals, holidays, and observances" |
|---|
|
|---|
| Obon | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "East Asian holidays" |
|---|
|
|---|
| Oral exam | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Education: General" |
|---|
|
|---|
| Ohio State University | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Big Ten" |
|---|
|
|---|
| Osaka University | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Japan" |
|---|
|
|---|
| Ojibwe | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Indigenous people" |
|---|
|
|---|
| Overseas Chinese | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "China_2" |
|---|
|
|---|
| Origin of speech | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Language: General" |
|---|
|
|---|
| Official script | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Spelling" |
|---|
|
|---|
| Onomatopoeia | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Vocabulary" |
|---|
|
|---|
| Oceanic languages | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Language families" |
|---|
|
|---|
| Oto-Manguean languages | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Language families" |
|---|
|
|---|
| Ogham | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Alphabets and writing systems" |
|---|
|
|---|
| Ojibwe language | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Algic languages" |
|---|
|
|---|
| Old French | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Romance languages" |
|---|
|
|---|
| Occitan language | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Romance languages" |
|---|
|
|---|
| Ossetian language | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Iranian languages" |
|---|
|
|---|
| Ovambo language | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Niger–Congo languages" |
|---|
|
|---|
| Old media | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Mass media" |
|---|
|
|---|
| Open access | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Mass media" |
|---|
|
|---|
| Online magazine | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Magazines" |
|---|
|
|---|
| Out (magazine) | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Specific magazines" |
|---|
|
|---|
| One Man's Family | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Programs" |
|---|
|
|---|
| Oshin | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Japan_3" |
|---|
|
|---|
| Only Fools and Horses | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "United Kingdom_3" |
|---|
|
|---|
| One Life to Live | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Soap operas" |
|---|
|
|---|
| Orange Is the New Black | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Post-1999" |
|---|
|
|---|
| Online shaming | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Internet medium" |
|---|
|
|---|
| Online streamer | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Culture" |
|---|
| section | "Internet medium" |
|---|
|
|---|
| Option (finance) | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Securities" |
|---|
|
|---|
| Open-pit mining | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Industry" |
|---|
|
|---|
| Occupational injury | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Employment" |
|---|
|
|---|
| Offshoring | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Employment" |
|---|
|
|---|
| Outsourcing | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Employment" |
|---|
|
|---|
| Online advertising | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Marketing" |
|---|
|
|---|
| Online shopping | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Marketing" |
|---|
|
|---|
| Offshore financial centre | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Taxation" |
|---|
|
|---|
| Opportunity cost | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Economics_2" |
|---|
|
|---|
| Output (economics) | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Economics_2" |
|---|
|
|---|
| Oracle Corporation | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Computing, telecommunication, electronics, and software" |
|---|
|
|---|
| Oath | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Basics" |
|---|
|
|---|
| Oath of office | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Basics" |
|---|
|
|---|
| Ostracism | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Punishments" |
|---|
|
|---|
| Outlaw | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Punishments" |
|---|
|
|---|
| Organic law | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Constitutional law" |
|---|
|
|---|
| Offer and acceptance | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Contract law" |
|---|
|
|---|
| Outlaw motorcycle club | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Crime" |
|---|
|
|---|
| Obstruction of justice in the United States | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Crimes against justice" |
|---|
|
|---|
| Offender profiling | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Criminology" |
|---|
|
|---|
| Objection (United States law) | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Legal procedure: General" |
|---|
|
|---|
| Opening statement | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Legal procedure: General" |
|---|
|
|---|
| Ordnance Survey | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "United Kingdom" |
|---|
|
|---|
| Office of Strategic Services | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "United States_2" |
|---|
|
|---|
| Organisation of African Unity | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Intergovernmental organizations" |
|---|
|
|---|
| Organization of the Black Sea Economic Cooperation | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Intergovernmental organizations" |
|---|
|
|---|
| Organisation of Islamic Cooperation | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Intergovernmental organizations" |
|---|
|
|---|
| Organisation internationale de la Francophonie | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Non-governmental organizations" |
|---|
|
|---|
| Oxfam | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Humanitarian organizations" |
|---|
|
|---|
| Ombudsman | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Titles" |
|---|
|
|---|
| Oil war | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Wars by type" |
|---|
|
|---|
| Operational level of war | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Politics and economics" |
|---|
| section | "Basics_3" |
|---|
|
|---|
| Operant conditioning | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Social studies" |
|---|
| section | "Concepts" |
|---|
|
|---|
| Openness to experience | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Social studies" |
|---|
| section | "Emotions and traits" |
|---|
|
|---|
| Observer status | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Social studies" |
|---|
| section | "Groups" |
|---|
|
|---|
| Otaku | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Social studies" |
|---|
| section | "Groups" |
|---|
|
|---|
| Oppression | | level | 5 |
|---|
| topic | "Society and social sciences" |
|---|
| sublist | "Social studies" |
|---|
| section | "Discrimination" |
|---|
|
|---|
| Olericulture | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Agriculture_2" |
|---|
|
|---|
| Offshore aquaculture | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Aquaculture" |
|---|
|
|---|
| Organic aquaculture | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Aquaculture" |
|---|
|
|---|
| Orangery | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Buildings and infrastructure" |
|---|
|
|---|
| Organ printing | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Biotechnology" |
|---|
|
|---|
| Open source | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Computing and information technology basics" |
|---|
|
|---|
| Optical computing | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Computer architecture concepts" |
|---|
|
|---|
| One-time pad | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Computer security" |
|---|
|
|---|
| Obfuscation (software) | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Computer security" |
|---|
|
|---|
| Office Open XML | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "File format" |
|---|
|
|---|
| OpenDocument | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "File format" |
|---|
|
|---|
| Ogg | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "File format" |
|---|
|
|---|
| Online chat | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Internet" |
|---|
|
|---|
| Online dating | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Internet" |
|---|
|
|---|
| Object code | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Software development: General" |
|---|
|
|---|
| Open Database Connectivity | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Software development: General" |
|---|
|
|---|
| OpenGL | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Software development: General" |
|---|
|
|---|
| Operator overloading | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Programming languages" |
|---|
|
|---|
| Objective-C | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Programming languages" |
|---|
|
|---|
| OLED | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Other media and communication technology" |
|---|
|
|---|
| Operational amplifier | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Components" |
|---|
|
|---|
| OR gate | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Digital logic" |
|---|
|
|---|
| Oil platform | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Fuel" |
|---|
|
|---|
| Oil lamp | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Lighting" |
|---|
|
|---|
| Overhead power line | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Electricity transmission and distribution" |
|---|
|
|---|
| Overhead cable | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Electricity transmission and distribution" |
|---|
|
|---|
| Oxygen mask | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Food, water and health" |
|---|
|
|---|
| Open-end spinning | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Spinning" |
|---|
|
|---|
| Oroville Dam | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Dams" |
|---|
|
|---|
| Optical spectrometer | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Measuring instruments" |
|---|
|
|---|
| Odometer | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Measuring instruments" |
|---|
|
|---|
| Onager (weapon) | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Artillery" |
|---|
|
|---|
| Octant (instrument) | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Navigation" |
|---|
|
|---|
| October | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Months" |
|---|
|
|---|
| One-way mirror | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Optical components" |
|---|
|
|---|
| Optical filter | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Optical components" |
|---|
|
|---|
| Optical isolator | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Optical components" |
|---|
|
|---|
| Orbital spaceflight | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Basics_5" |
|---|
|
|---|
| Opportunity (rover) | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Rovers" |
|---|
|
|---|
| Off-road vehicle | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Motorized road transport" |
|---|
|
|---|
| Outrigger | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Naval transport" |
|---|
|
|---|
| Ocean liner | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Naval transport" |
|---|
|
|---|
| Oil tanker | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Naval transport" |
|---|
|
|---|
| O'Hare International Airport | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "North America" |
|---|
|
|---|
| Osaka Metro | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Japan" |
|---|
|
|---|
| Oslo Metro | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Scandinavia" |
|---|
|
|---|
| Orient Express | | level | 5 |
|---|
| topic | "Technology" |
|---|
| section | "Railway services" |
|---|
|
|---|
