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Sayles, John

(Encyclopedia)Sayles, John (John Thomas Sayles), 1950–, one of America's most influential independent filmmakers as well as a screenwriter, fiction writer, playwright, and actor, b. Schenectady, N.Y., grad. Willi...

satellite, natural

(Encyclopedia)satellite, natural, celestial body orbiting a planet, dwarf planet, asteroid, or star of a larger size. The most familiar natural satellite is the earth's moon; thus, satellites of other planets are o...

Petraeus, David Howell

(Encyclopedia)Petraeus, David Howell pĕtrāˈəs [key], 1952–, American military officer and government official, b. Cornwall, N.Y., studied West Point (B.S., 1974), U.S. Army Command and General Staff College (...

Warren, Elizabeth

(Encyclopedia) Warren, Elizabeth, 1949- , American politician, b. Oklahoma City, Ok., as Elizabeth Ann Herring, Univ. of Houston (1970, B.S.); Rutgers-Newark La...

Bowie, David

(Encyclopedia)Bowie, David, 1947–2016, British rock-and-roll singer and songwriter who successfully, merged rock, art, and fashion, b. London as David Robert Jones. After singing with five different bands in the ...

Sirleaf, Ellen Johnson

(Encyclopedia)Sirleaf, Ellen Johnson sĭrlēfˈ [key], 1938–, Liberian economist and political leader. Educated in the United States (M.P.A. Harvard, 1971), she worked in the Liberian government (1964–67, 1977�...

Salinger, J. D.

(Encyclopedia)Salinger, J. D. (Jerome David Salinger) sălˈĭnjər [key], 1919–2010, American novelist and short-story writer, b. New York City. His considerable literary stature rests on a small but extremely i...

galaxy

(Encyclopedia)CE5 Hubble classification of galaxies: Elliptical galaxies (E) are classified according to the degree of flattening of the ellipse. Spiral galaxies (S) and barred spiral galaxies (SB) are classifie...

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...

thorium

(Encyclopedia)thorium thôrˈēəm [key] [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; va...