Columbia Encyclopedia

(Encyclopedia) Grand Forks, city (2020 pop. 59,166), seat of Grand Forks co., E N.Dak., at the confluence of the Red and the Red Lake rivers; inc. 1881. In a spring wh...

(Encyclopedia) mandrill, large monkey, Mandrillus sphinx, of central W Africa, related to the baboons. Mandrills are found in forests, while baboons live in open country. The fur of the mandrill is mostly dark brown...

(Encyclopedia) chinch bug, small North American bug, Blissus leucopterus, of the seed bug family. It feeds on small grains, corn, and other grasses, sucking the plant juices and doing much damage to crops, particula...

(Encyclopedia) hawthorn, any species of the genus Crataegus of the family Rosaceae (rose family), shrubs and trees widely distributed in north temperate climates and especially common in E North America. They usuall...

(Encyclopedia) Cultural Revolution, 1966–76, mass mobilization of urban Chinese youth inaugurated by Mao Zedong in an attempt to prevent the development of a bureaucratized Soviet style of Communism. Mao closed sc...

(Encyclopedia) chaos theory, in mathematics, physics, and other fields, a set of ideas that attempts to reveal structure in aperiodic, unpredictable dynamic systems such as cloud formation or the fluctuation of biol...

(Encyclopedia) Rosenquist, James, 1933–2017, American painter, b. Grand Forks, N.Dak., studied Univ. of Minnesota (1952–54), Art Students League, New York City (1955). An important figure in the pop art movement...

(Encyclopedia) radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direc...

(Encyclopedia) hail, precipitation in the form of pellets composed of ice or of ice and snow, occurring at any time of the year, usually during the passage of a cold front or during a thunderstorm. Small hailstones ...

(Encyclopedia) Norwich terrier, breed of small, sturdy terrier developed in England in the second half of the 19th cent. It stands about 10 in. (25.4 cm) high at the shoulder and weighs about 11 lb (4.9 kg). The har...