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Cohen, Samuel Theodore

(Encyclopedia)Cohen, Samuel Theodore, 1921–2010, American physicist known as the “father of the neutron bomb,” b. Brooklyn, N.Y., grad. Univ. of California, Los Angeles, 1943. He worked on the Manhattan Proje...

alkali metals

(Encyclopedia)alkali metals, metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univ...

alkaline-earth metals

(Encyclopedia)alkaline-earth metals, metals constituting Group 2 of the periodic table. Generally, they are softer than most other metals, react readily with water (especially when heated), and are powerful reducin...

electron-volt

(Encyclopedia)electron-volt, abbr. eV, unit of energy used in atomic and nuclear physics; 1 electron-volt is the energy transferred in moving a unit charge, positive or negative and equal to that charge on the elec...

spectroscope

(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...

butoh

(Encyclopedia)butoh [Jap.,=dance of darkness], avant-garde dance form developed in post–World War II Japan. First performed in 1959 by the dancers Tatsumi Hijikata (1928–86) and Kazuo Ohno (1906–2010), butoh ...

metronome

(Encyclopedia)metronome mĕˈtrənōmˌ [key], in music, originally pyramid-shaped clockwork mechanism to indicate the exact tempo in which a work is to be performed. It has a double pendulum whose pace can be alte...

Lachenmann, Helmut

(Encyclopedia)Lachenmann, Helmut, 1935–, German composer, b. Stuttgart. One of the most influential European composers of the late 20th and early 21st cents., he studied in Venice with Luigi Nono (1958–60) and ...

kithara

(Encyclopedia)kithara sĭthˈ– [key], musical instrument of the ancient Greeks. It was a plucked instrument, a larger and stronger form of the lyre, used by professional musicians both for solo playing and for th...

Ross, Barney David

(Encyclopedia)Ross, Barney David, 1909–67, American boxer, b. New York City as Dov-Ber Rasofsky; he was also known as Beryl David Rasofsky and Barnet David Rasofsky. After an amateur career, Ross turned professio...