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Lee, Tsung-Dao

(Encyclopedia)Lee, Tsung-Dao dzo͝ongˈ-douˈ lēˈ [key], 1926–, American physicist, b. China, Ph.D. Univ. of Chicago, 1950. He was a member (1951–53) of the Institute for Advanced Study, Princeton; and profes...

momentum

(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...

lepton

(Encyclopedia)lepton lĕpˈtŏnˌ [key] [Gr.,=light (i.e., lightweight)], class of elementary particles that includes the electron and its antiparticle, the muon and its antiparticle, the tau and its antiparticle, ...

Bio, Julius Maada

(Encyclopedia)Bio, Julius Maada, 1964–, Sierra Leonean political leader. He served in the Sierra Leone armed forces in Liberia (1990–91) as part of a UN peacekeeping force, and then fought in the Sierra Leone c...

Currie, Sir Arthur William

(Encyclopedia)Currie, Sir Arthur William, 1875–1933, Canadian commander in World War I. He made a distinguished record for himself in World War I as a brigade and division commander, particularly at Ypres (1915) ...

Daun, Leopold Joseph Maria, Graf von

(Encyclopedia)Daun, Leopold Joseph Maria, Graf von lāˈōpôlt yōˈzĕf märēˈä gräf fən doun [key], 1705–66, Austrian field marshal. He gained distinction in the War of the Austrian Succession. Daun later...

Anniston

(Encyclopedia)Anniston ănˈĭstən [key], city, seat of Calhoun co., NE Ala., in a mining region of the Appalachian foothills; inc. 1873. Its manufactures include soil pipes, textiles,...

Five Forks

(Encyclopedia)Five Forks, crossroads near Dinwiddie Courthouse, SW of Petersburg, Va. The last important battle of the Civil War was fought there on Apr. 1, 1865. Philip H. Sheridan, leading his own and Gouverneur ...

Oahe Dam

(Encyclopedia)Oahe Dam ōwäˈhē [key], major unit of the Missouri River basin project, 242 ft (74 m) high and 9,360 ft (2,853 m) long, on the Missouri River, central S.Dak., near Pierre; built 1948–63 by the U....

Norwich University

(Encyclopedia)Norwich University, at Northfield and Montpelier, Vt.; coeducational; founded 1819 as a private military college, opened 1820 at Norwich, Vt.; chartered under present name 1834, moved to Northfield 18...