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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...

refraction

(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...

solid waste

(Encyclopedia)solid waste, discarded materials other than fluids. In the United States in 1996, nearly 210 million tons—about 4.3 lb. (2 kg) per person daily (up from 2.7 lb./1.2 kg in 1960)—were collected and ...

Ávila Camacho, Manuel

(Encyclopedia)Ávila Camacho, Manuel mänwĕlˈ äˈvēlä kämäˈchō [key], 1897–1955, president of Mexico (1940–46). As a young man, Ávila Camacho joined the revolutionary forces. Later he became brigadier...

Leonov, Aleksei Arkhipovich

(Encyclopedia)Leonov, Aleksei Arkhipovich ŭlˌyĭksyāˈ ärkhˌyĭpôˈvyĭch [key], 1934–2019, Soviet-Russian cosmonaut and military officer. While serving as copilot of Voskhod 2 (Mar. 18–19, 1964), he beca...

liming

(Encyclopedia)liming līmˈĭng [key], application to the soil of calcium in various forms, generally as ground limestone, but also as marl, chalk, shells, or hydrated lime. Lime benefits soil by neutralizing acidi...

Lubbock

(Encyclopedia)Lubbock, city (1990 pop. 186,206), seat of Lubbock co., NW Tex.; inc. 1909. In the Llano Estacado region on a branch of the Brazos River, it was settled in 1879 by Quakers. It is the trade center for ...

Melville Peninsula

(Encyclopedia)Melville Peninsula, 24,156 sq mi (62,564 sq km), c.250 mi (400 km) long and from 70 to 135 mi (113–217 km) wide, Nunavut, Canada, between the Gulf of Bothnia and Foxe Basin, and separated from Baffi...

Mesa, city, United States

(Encyclopedia)Mesa māˈsə [key], city (1990 pop. 288,091), Maricopa co., S central Ariz., in the irrigated Salt River valley; inc. 1883. Electronic components, fabricated metals, aircraft, and machine tools are a...

Klein, Ralph Phillip

(Encyclopedia)Klein, Ralph Phillip, 1942–2013, Canadian politician, b. Calgary. He served in the Canadian air force and worked in public relations and as a weathercaster and reporter in radio and television befor...