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United States Naval Observatory

(Encyclopedia)United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded...

Miles, Nelson Appleton

(Encyclopedia)Miles, Nelson Appleton, 1839–1925, American army officer, b. near Westminster, Mass. In 1861, at the outbreak of the Civil War, he left his job in a Boston store and organized a company of volunteer...

National Radio Astronomy Observatory

(Encyclopedia)National Radio Astronomy Observatory (NRAO), federal observatory for radio astronomy, founded in 1956 and operated under contract with the National Science Foundation by Associated Universities, Inc.,...

Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

pigment

(Encyclopedia)pigment, substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface. The pigments used i...

Coen Brothers

(Encyclopedia)Coen Brothers, American filmmakers Joel Coen, 1955–, and Ethan Coen, 1958–, both b. St. Louis Park, Minn. Joel studied at New York Univ. Film School (B.A., 1978), Ethan at Princeton (B.A., 1979). ...

serpentine

(Encyclopedia)serpentine sûrˈpəntēn, –tīn [key], hydrous silicate of magnesium. It occurs in crystalline form only as a pseudomorph having the form of some other mineral and is generally found in the form of...

rhenium

(Encyclopedia)rhenium rēˈnēəm [key], metallic chemical element; symbol Re; at. no. 75; at. wt. 186.207; m.p. about 3,180℃; b.p. about 5,625℃; sp. gr. 21.02 at 20℃; valence −1, +2, +3, +4, +5, +6, or +7....

Wallace, David Foster

(Encyclopedia)Wallace, David Foster, 1962–2008, American writer, b. Ithaca, N.Y., grad. Amherst College (B.A., 1985), Univ. of Arizona (M.F.A., 1987). He published his comic first novel, The Broom of the System (...

vanadium

(Encyclopedia)vanadium vənāˈdēəm [key], metallic chemical element; symbol V; at. no. 23; at. wt. 50.9415; m.p. about 1,890℃; b.p. 3,380℃; sp. gr. about 6 at 20℃; valence +2, +3, +4, or +5. Vanadium is a ...