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micromechanics

(Encyclopedia)micromechanics, the combination of minuscule electrical and mechanical components in a single device less than 1 mm across, such as a valve or a motor. Although micromechanical production processes an...

Sanger, Margaret Higgins

(Encyclopedia)Sanger, Margaret Higgins, 1879–1966, American leader in the birth control movement, b. Corning, N.Y. Personal experience and work as a public-health nurse, much of it on New York City's Lower East S...

rare-earth metals

(Encyclopedia)rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, whi...

Beauvoir, Simone de

(Encyclopedia)Beauvoir, Simone de sēmônˈ də bōvwärˈ [key], 1908–86, French author. A leading exponent of existentialism, she is closely associated with Jean-Paul Sartre, with whom she had a life-long relat...

Constitution, ship

(Encyclopedia)Constitution, U.S. 44-gun frigate, nicknamed Old Ironsides. It is perhaps the most famous vessel in the history of the U.S. navy. Authorized by Congress in 1794, the ship was launched in 1797 and was ...

Chautauqua movement

(Encyclopedia)Chautauqua movement, development in adult education somewhat similar to the lyceum movement. It derived from an institution at Chautauqua, N.Y. There, in 1873, John Heyl Vincent and Lewis Miller propo...

Chávez, César Estrada

(Encyclopedia)Chávez, César Estrada sāˈsär āsträˈᵺä shäˈvĕz [key], 1927–93, American agrarian labor leader, b. near Yuma, Ariz. A migrant worker, he became involved (1952) in the self-help Community...

Clarke, Arthur C.

(Encyclopedia)Clarke, Arthur C. (Sir Arthur Charles Clarke), 1917–2008, British science fiction writer. During World War II he served as a radar instructor and aviator in the Royal Air Force. After the war he obt...

Gluck, Christoph Willibald von

(Encyclopedia)Gluck, Christoph Willibald von krĭsˈtôf vĭlˈēbält fən glo͝ok [key], 1714–87, German-born operatic composer. Gluck revolutionized opera by establishing lyrical tragedy as a unified vital art...

gold rush

(Encyclopedia)gold rush, influx of prospectors, merchants, adventurers, and others to newly discovered gold fields. One of the most famous of these stampedes in pursuit of riches was the California gold rush. The d...