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Oak Ridge

(Encyclopedia)Oak Ridge, city (1990 pop. 27,310), Anderson and Roane counties, E Tenn., on Black Oak Ridge and the Clinch River; founded by the U.S. government 1942, inc. as an independent city 1959. For years Oak ...

Nunn, Sam

(Encyclopedia)Nunn, Sam (Samuel Augustus Nunn, Jr.), 1938–, U.S. Senator from Georgia (1973–97), b. Perry, Ga. A lawyer, he was a member of the Georgia House of Representatives (1968–72) and won election as a...

tank, military

(Encyclopedia)tank, military, armored vehicle having caterpillar traction and armed with machine guns, cannon, rockets, or flame throwers. The tank, together with the airplane, opened up modern warfare, which had b...

Bronze Age

(Encyclopedia)Bronze Age, period in the development of technology when metals were first used regularly in the manufacture of tools and weapons. Pure copper and bronze, an alloy of copper and tin, were used indiscr...

Goeppert-Mayer, Maria

(Encyclopedia)Goeppert-Mayer, Maria, 1906–72, German-American nuclear physicist, Ph.D. Univ. of Göttingen, 1930. She was a researcher at Johns Hopkins (1931–39), Columbia (1939–46), Argonne National Laborato...

Anzus Treaty

(Encyclopedia)Anzus Treaty ănˈzəs [key], defense agreement signed in 1951 by Australia, New Zealand, and the United States. The name Anzus is derived from the initials of the three signatory nations. As a result...

pillbox

(Encyclopedia)pillbox, small, low fortification that houses machine guns and antitank weapons. Similar to a blockhouse, it is usually made of concrete, steel, logs, or filled sandbags. Pillboxes came into use durin...

atomic energy

(Encyclopedia)atomic energy: see nuclear energy. ...

thermonuclear energy

(Encyclopedia)thermonuclear energy: see nuclear energy. ...

breeder reactor

(Encyclopedia)breeder reactor: see nuclear reactor. ...