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Biochemistry or biological chemistry is the study of chemical processes within and relating to living organisms. A sub-discipline of both chemistry and...

Self-harm is intentional conduct that is considered harmful to oneself. This is most commonly regarded as direct injury of one's own skin tissues usually...

Hubris (/ˈhjuːbrɪs/; from Ancient Greek ὕβρις (húbris) 'pride, insolence, outrage'), or less frequently hybris (/ˈhaɪbrɪs/), describes a personality quality...

A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a muzzle device that suppresses the blast created when a gun (firearm...

A salmon run is an annual fish migration event where many salmonid species, which are typically hatched in fresh water and live most of the adult life...

Viral marketing is a business strategy that uses existing social networks to promote a product mainly on various social media platforms. Its name refers...

Bounded rationality is the idea that rationality is limited when individuals make decisions, and under these limitations, rational individuals will select...

The American chestnut (Castanea dentata) is a large, fast-growing deciduous tree of the beech family native to eastern North America. As is true of all...

Arcology, a portmanteau of "architecture" and "ecology", is a field of creating architectural design principles for very densely populated and ecologically...

The extensive and rapid clearing of forests (deforestation) within the borders of Nigeria has significant impacts on both local and global scales. Deforestation...

A three-letter acronym (TLA), or three-letter abbreviation, is as the phrase suggests an abbreviation consisting of three letters. The abbreviation for...

.br is the Internet country code top-level domain (ccTLD) for Brazil. It was administered by the Brazilian Internet Steering Committee until 2005 when...

In astronomy, superluminal motion is the apparently faster-than-light motion seen in some radio galaxies, BL Lac objects, quasars, blazars and recently...

Hans Joachim Pabst von Ohain (14 December 1911 – 13 March 1998) was a German physicist, engineer, and the designer of the first turbojet engine to power...

A blowout preventer (BOP) (pronounced B-O-P) is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to...

A list of future observable astronomical events. These are by no means all events, but only the notable or rare ones. In particular, it does not include...

Olympian spirits (or Olympic spirits, Olympick spirits) refers to seven spirits mentioned in several Renaissance and post-Renaissance books of ritual magic/ceremonial...

A coherent system of units is a system of units of measurement used to express physical quantities that are defined in such a way that the equations relating...

In chemistry, a hydridonitride (nitridohydride, nitride hydride, or hydride nitride) is a chemical compound that contains both hydride (H−) and nitride...

In general relativity, Birkhoff's theorem states that any spherically symmetric solution of the vacuum field equations must be static and asymptotically...