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Van de Graaff, Robert Jemison

(Encyclopedia)Van de Graaff, Robert Jemison văn də gräf [key], 1901–67, American physicist, b. Tuscaloosa, Ala., grad. Univ. of Alabama (B.S., 1922), Ph.D. Oxford, 1928. He was research associate at Massachuse...

Purbeck

(Encyclopedia)Purbeck, district (1991 pop. 42,600), Dorset, England. Purbeck is filled with the clays of the Hampshire Basin, and is therefore largely infertile. Some minor farming occurs on the chalk plateaus and ...

Strong, William Duncan

(Encyclopedia)Strong, William Duncan, 1899–1962, American anthropologist, b. Portland, Oreg., grad. Univ. of California (B.A., 1923; Ph.D., 1926). He served as curator at the Chicago Field Museum (1926–29) and ...

Philippe, Édouard Charles

(Encyclopedia)Philippe, Édouard Charles, 1970–, French lawyer and political leader, b. Rouen, grad. Paris Institute of Political Studies, 1992, National School of Administration, 1997. He worked as a lawyer for ...

York, city, United States

(Encyclopedia)York, city (1990 pop. 42,192), seat of York co., SE Pa., on Codorus Creek, in an agricultural area; laid out 1741, inc. as a city 1887. It is a market, trade, processing, and distribution center in th...

Rowhani, Hassan

(Encyclopedia)Rowhani, Hassan häsänˈ rōhänēˈ [key], 1948–, Iranian cleric and political leader, b. Sorkheh, ...

parity

(Encyclopedia)parity or space parity, in physics, quantity that refers to the relationship between an object or process and the image that it can produce in a mirror. For example, any right-handed object will produ...

gadolinium

(Encyclopedia)gadolinium gădəlĭnˈēəm [key], metallic chemical element; symbol Gd; at. no. 64; at. wt. 157.25; m.p. 1,312℃; b.p. 3,233℃; sp. gr. 7.898 at 25℃; valence +3. Gadolinium is a malleable, ducti...

deer

(Encyclopedia)deer, ruminant mammal of the family Cervidae, found in most parts of the world except Australia. Antlers, solid bony outgrowths of the skull, develop in the males of most species and are shed and rene...

poison gas

(Encyclopedia)poison gas, any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the ...