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3 天前 · An intelligence quotient ( IQ) is a total score derived from a set of standardised tests or subtests designed to assess human intelligence. [1] The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in ...
3 天前 · Capsaicin (8-methyl-N-vanillyl-6-nonenamide) (/ k æ p ˈ s eɪ s ɪ n / or / k æ p ˈ s eɪ ə s ɪ n /) is an active component of chili peppers, which are plants belonging to the genus Capsicum.It is a chemical irritant and neurotoxin for mammals, including humans, and produces a sensation of burning in any tissue with which it comes into contact. . Capsaicin and several related amides ...
2 天前 · Veganism is the practice of abstaining from the use of animal products —particularly in diet —and an associated philosophy that rejects the commodity status of animals. [c] A person who practices veganism is known as a vegan . The foundations of veganism include ethical, moral, environmental, health and humanitarian arguments.
2 天前 · Chinese New Year or the Spring Festival (see also § Names) is a festival that celebrates the beginning of a new year on the traditional lunisolar Chinese calendar. Marking the end of winter and the beginning of spring, observances traditionally take place from Chinese New Year's Eve, the evening preceding the first day of the year, to the ...
1 天前 · Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...
