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Stein, Gertrude

(Encyclopedia)Stein, Gertrude, 1874–1946, American author and patron of the arts, b. Allegheny (now part of Pittsburgh), Pa. A celebrated personality, she encouraged, aided, and influenced—through her patronage...

chlorofluorocarbons

(Encyclopedia)chlorofluorocarbons klōrˌəflo͝orˈəkärˌbənz, klôrˌ– [key] (CFCs), organic compounds that contain carbon, chlorine, and fluorine atoms. CFCs are highly effective refrigerants that were deve...

atomic bomb

(Encyclopedia)atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alam...

foundation

(Encyclopedia)foundation, institution through which private wealth is contributed and distributed for public purpose. Foundations have existed since Greek and Roman times, when they honored deities. During the Midd...

Howells, William Dean

(Encyclopedia)Howells, William Dean, 1837–1920, American novelist, critic, and editor, b. Martins Ferry, Ohio. Both in his own novels and in his critical writing, Howells was a champion of realism in American lit...

Ba'ath party

(Encyclopedia)Ba'ath party bäˈäth [key], Arab political party, in Syria and in Iraq. Founded in Damascus in 1941 with an ideology of secularism, socialism, and pan-Arab unionism, it was reformed with the name Ba...

Pound, Ezra Loomis

(Encyclopedia)Pound, Ezra Loomis, 1885–1972, American poet, critic, and translator, b. Hailey, Idaho, grad. Hamilton College, 1905, M.A. Univ. of Pennsylvania, 1906. An extremely important influence in the shapin...

Pseudepigrapha

(Encyclopedia)Pseudepigrapha so͞oˌdĭpĭˈgrəfə [key] [Gr.,=things falsely ascribed], a collection of early Jewish and some Jewish-Christian writings composed between c.200 b.c. and c.a.d. 200, not found in the...

antiparticle

(Encyclopedia)antiparticle, elementary particle corresponding to an ordinary particle such as the proton, neutron, or electron, but having the opposite electrical charge and magnetic moment. Every elementary partic...

helium

(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...