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Eight sovereign states have publicly announced successful detonation of nuclear weapons. Five are considered to be nuclear-weapon states (NWS) under the...

The Lockheed P-80 Shooting Star was the first jet fighter used operationally by the United States Army Air Forces (USAAF) during World War II. Designed...

A circadian rhythm (/sərˈkeɪdiən/), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any...

This article contains Ethiopic text. Without proper rendering support, you may see question marks, boxes, or other symbols instead of Ethiopic characters...

Atmospheric entry (sometimes listed as Vimpact or Ventry) is the movement of an object from outer space into and through the gases of an atmosphere of...

The foot (pl.: feet) is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion...

Radioactive waste is a type of hazardous waste that contains radioactive material. Radioactive waste is a result of many activities, including nuclear...

Suicidal ideation, or suicidal thoughts, is the thought process of having ideas, or ruminations about the possibility of completing suicide. It is not...

In mathematics, rings are algebraic structures that generalize fields: multiplication need not be commutative and multiplicative inverses need not exist...

Objective-C is a high-level general-purpose, object-oriented programming language that adds Smalltalk-style message passing (messaging) to the C programming...

Sexual abstinence or sexual restraint is the practice of refraining from sexual activity for reasons medical, psychological, legal, social, philosophical...

Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate...

HTC Corporation (Chinese: 宏達國際電子股份有限公司; pinyin: Hóngdá Guójì Diànzǐ Gǔfèn Yǒuxiàn Gōngsī), or High Tech Computer Corporation (abbreviated and trading as...

The American mink (Neogale vison) is a semiaquatic species of mustelid native to North America, though human introduction has expanded its range to many...

The Mikoyan MiG-31 (Russian: Микоян МиГ-31; NATO reporting name: Foxhound) is a supersonic interceptor aircraft developed for the Soviet Air Forces by...

The Aero L-39 Albatros is a high-performance jet trainer designed and produced by Aero Vodochody in the Czech Republic. In addition to performing basic...

Spider monkeys are New World monkeys belonging to the genus Ateles, part of the subfamily Atelinae, family Atelidae. Like other atelines, they are found...

A computer cluster is a set of computers that work together so that they can be viewed as a single system. Unlike grid computers, computer clusters have...

The Eurasian magpie or common magpie (Pica pica) is a resident breeding bird throughout the northern part of the Eurasian continent. It is one of several...

The Antonov An-124 Ruslan (Russian: Антонов Ан-124 Руслан; Ukrainian: Ан-124 Руслан, lit. 'Ruslan'; NATO reporting name: Condor) is a large, strategic...