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Cookeville

(Encyclopedia) Cookeville, city (2020 pop. 34,842), seat of Putnam co., N central Tenn.; inc. 1854. It is a farm trade center that also produces…

molecular orbital theory

(Encyclopedia) molecular orbital theory, detailed explanation of how electrons are distributed in stable molecules. In the simpler valence theory of the chemical bond, each atom in a molecule is…

Mount Vernon, estate, United States

(Encyclopedia) Mount Vernon, NE Va., overlooking the Potomac River near Alexandria, S of Washington, D.C.; home of George Washington from 1747 until his death in 1799. The land was patented in 1674,…

American Film Institute

(Encyclopedia) American Film Institute (AFI), nonprofit organization established in Washington, D.C., in 1967 by the National Endowment for the Arts to preserve and catalog American films and…

cement

(Encyclopedia) cement, binding material used in construction and engineering, often called hydraulic cement, typically made by heating a mixture of limestone and clay until it almost fuses and then…

weathering

(Encyclopedia) weathering, collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things…

Green, Anna Katherine

(Encyclopedia) Green, Anna Katherine, 1846–1935, American detective-story writer, b. Brooklyn, N.Y., grad. Ripley Female College, Poultney, Vt., 1867. Of her many thrillers, characterized by logical…

Uniondale

(Encyclopedia) Uniondale, uninc. residential city (1990 pop. 20,328), Nassau co., SE N.Y., on Long Island. Downtown suburban growth since the 1970s has included construction of the Nassau Coliseum,…

Littleton

(Encyclopedia) Littleton, city (1990 pop. 33,685), seat of Arapahoe co., N central Colo.; platted 1812, inc. 1890. It is a suburb south of Denver in an irrigated farm area. Its manufactures include…

Kaiser, Henry John

(Encyclopedia) Kaiser, Henry John, 1882–1967, American industrialist, b. Sprout Brook, N.Y. He organized his first construction company in 1913, soon entered the road-paving business, and by 1930 was…