Columbia Encyclopedia

(Encyclopedia) Bohr, Niels Henrik David bōr [key], 1885–1962, Danish physicist, one of the foremost scientists of modern physics. He studied at the Univ. of Copenhagen (Ph.D. 1911) and carried on research on the...

(Encyclopedia)  CE5 North America, third largest continent (2015 est. pop. 571,949,000), c.9,400,000 sq mi (24,346,000 sq km), the northern of the two continents of the Western Hemisphere. North America includes a...

(Encyclopedia) African art, art created by the peoples south of the Sahara. The predominant art forms are masks and figures, which were generally used in religious ceremonies. The decorative arts, especially in text...

(Encyclopedia) Cabeza de Vaca, Álvar Núñez älˈvär no͞oˈnyāth käbāˈthä dā väˈkä [key], c.1490–c.1557, Spanish explorer. Cabeza de Vaca [cow's head] was not actually a surname but a hereditary title...

(Encyclopedia) Hidalgo y Costilla, Miguel mēgĕlˈ ēᵺälˈgō ē kōstēˈyä [key], 1753–1811, Mexican priest and revolutionary, a national hero. A creole intellectual, he was influenced by the French Revolut...

(Encyclopedia) Baja California Span.: bäˈhä kälēfōrˈnyä [key] or Lower California, peninsula, c.760 mi (1,220 km) long and from 30 to 150 mi (48–241 km) wide, NW Mexico, separating the Gulf of California f...

(Encyclopedia) Toledo, city (1990 pop. 60,671), capital of Toledo prov. and of Castile–La Mancha, central Spain, on a granite hill surrounded on three sides by a gorge of the Tagus River. Historically and cultural...

(Encyclopedia) Villa, Francisco fränsēsˈkō vēˈyä [key], c.1877–1923, Mexican revolutionary, nicknamed Pancho Villa. His real name was Doroteo Arango. When Villa came of age, he declared his freedom from the...

(Encyclopedia) air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...

(Encyclopedia)  CE5 New Mexico, state in the SW United States. At its northwestern corner are the so-called Four Corners, where Colorado, New Mexico, Arizona, and Utah meet at right angles; New Mexico is also bord...