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The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating...

Zoophilia is a paraphilia in which a person experiences a sexual fixation on non-human animals. Bestiality instead refers to cross-species sexual activity...

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of...

In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify...

Gram-negative bacteria are bacteria that unlike gram-positive bacteria do not retain the crystal violet stain used in the Gram staining method of bacterial...

QWERTY (/ˈkwɜːrti/ KWUR-tee) is a keyboard layout for Latin-script alphabets. The name comes from the order of the first six keys on the top letter row...

A meteoroid (/ˈmiːtiərɔɪd/ MEE-tee-ə-royd) is a small rocky or metallic body in outer space. Meteoroids are distinguished as objects significantly smaller...

The Chevrolet Silverado is a range of trucks manufactured by General Motors under the Chevrolet brand. Introduced for the 1999 model year, the Silverado...

Microsoft Edge (or simply Edge) is a proprietary cross-platform web browser created by Microsoft. Released in 2015 as part of Windows 10 and Xbox One,...

Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, magpies, jackdaws, jays, treepies, choughs, and nutcrackers...

Plastic surgery is a surgical specialty involving the restoration, reconstruction, or alteration of the human body. It can be divided into two main categories:...

Euclidean space is the fundamental space of geometry, intended to represent physical space. Originally, in Euclid's Elements, it was the three-dimensional...

T cells are one of the important types of white blood cells of the immune system and play a central role in the adaptive immune response. T cells can be...

Platelets or thrombocytes (from Ancient Greek θρόμβος (thrómbos) 'clot', and κύτος (kútos) 'cell') are a blood component whose function (along with the...

Sex education, also known as sexual education, sexuality education or sex ed, is the instruction of issues relating to human sexuality, including human...

A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two...

A pipeline is a system of pipes for long-distance transportation of a liquid or gas, typically to a market area for consumption. The latest data from 2014...

A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact...

The Wankel engine (/ˈvaŋkəl̩/, VUN-kell) is a type of internal combustion engine using an eccentric rotary design to convert pressure into rotating motion...

Pretty Good Privacy (PGP) is an encryption program that provides cryptographic privacy and authentication for data communication. PGP is used for signing...