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Arendt, Hannah

(Encyclopedia)Arendt, Hannah hänˈä ärˈənt [key], 1906–75, German-American political theorist, b. Hanover, Germany, B.A. Königsberg, 1924, Ph.D. Heidelberg, 1928. In 1925 she met Martin Heidegger, who great...

Menger, Carl

(Encyclopedia)Menger, Carl kärl mĕngˈər [key], 1840–1921, Austrian economist, a founder of the Austrian school of economics. He was professor of economics at the Univ. of Vienna from 1873 until 1903, when he ...

ethology

(Encyclopedia)ethology, study of animal behavior based on the systematic observation, recording, and analysis of how animals function, with special attention to physiological, ecological, and evolutionary aspects. ...

Jena

(Encyclopedia)Jena yāˈnä [key], city (1994 pop. 100,090), Thuringia, E central Germany, on the Saale River. Manufactures of this industrial center include pharmaceuticals, glass, optical and precision instrument...

Karle, Jerome

(Encyclopedia)Karle, Jerome kärl [key], 1918–2013, American physicist, b. New York City, Ph.D. Univ. of Michigan, 1943. He worked on the Manhattan Project before beginning a career (1946–2009) at the U.S. Nava...

Bonhoeffer, Dietrich

(Encyclopedia)Bonhoeffer, Dietrich dēˈtrĭkh bônˈhöfər [key], 1906–45, German Protestant theologian. Bonhoeffer, influenced early by the thinking of the young Karl Barth, urged a conformation to the form of...

tracer

(Encyclopedia)tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the molecule it replaces a...

Lassalle, Ferdinand

(Encyclopedia)Lassalle, Ferdinand fĕrˈdēnänt läsälˈ [key], 1825–64, German socialist. The son of a Jewish merchant, he studied at the universities of Breslau and Berlin, where he became a philosophical Heg...

Křenek, Ernst

(Encyclopedia)Křenek, Ernst krĕˈnĕk, Czech kerzhĕˈnĕk [key], 1900–1991, Austrian-American composer, b. Vienna. to Czech parents. He studied in Vienna and Berlin, and in the early 1920s he composed chamber ...

Royal Opera

(Encyclopedia)Royal Opera, one of the principal British opera companies, based at the Royal Opera House (which it shares with the Royal Ballet) in Covent Garden, London. Formed in 1946 as the Covent Garden Opera Co...