General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

Mesosphere

Science; General science

A layer within the Earth's atmosphere that extends from about 50 to 85 km (31 to 53 mi) above the surface. The mesosphere is predominantly characterised by its thermal structure. On average, ...

Conditioned reflex

Science; General science

A learned response performed by a trained animal to a signal that was previously associated with an event of consequence for that animal. Conditioned reflex (CR) was first used by the Russian ...

A lesion on the surface of the skin or a mucous membrane characterised by a superficial loss of tissue. Ulcers are most common on the skin of the lower extremities and in the gastrointestinal tract, ...

Ultralight aircraft

Science; General science

A lightweight, single-seat aircraft with low flight speed and power, used for sport or recreation. Ultralights evolved from hang gliders, and the first models were crude, home-built modifications of ...

Equine infectious anaemia

Science; General science

A lentivirus-induced disease of the horse family with an almost worldwide distribution. It is characterised by recurring fever, platelet reduction, weight loss, edema, and anemia. Although death can ...

Phonolite

Science; General science

A light-colored, aphanitic (not visibly crystalline) rock of volcanic origin, composed largely of alkali feldspar, feldspathoids (nepheline, leucite, sodalite), and smaller amounts of dark-colored ...

Trachyte

Science; General science

A light-colored, aphanitic (very finely crystalline) rock of volcanic origin, composed largely of alkali feldspar with minor amounts of dark-colored (mafic) minerals (biotite, hornblende, or ...