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American Museum of Natural History

(Encyclopedia)American Museum of Natural History, incorporated in New York City in 1869 to promote the study of natural science and related subjects. Buildings on its present site facing Central Park were opened in...

Jessup, Philip Caryl

(Encyclopedia)Jessup, Philip Caryl, 1897–1986, American authority on international law, b. New York City, grad. Hamilton College, 1919, LL.B. Yale, 1924, Ph.D. Columbia, 1927. He was admitted (1925) to the bar, a...

molecular orbital theory

(Encyclopedia)molecular orbital theory, detailed explanation of how electrons are distributed in stable molecules. In the simpler valence theory of the chemical bond, each atom in a molecule is assumed to retain it...

mesoderm

(Encyclopedia)mesoderm, in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball. Con...

Orbiting Astronomical Observatory

(Encyclopedia)Orbiting Astronomical Observatory (OAO), series of four orbiting observatories (see observatory, orbiting) launched between 1966 and 1972 by the National Aeronautics and Space Administration (NASA) to...

Martin, Agnes

(Encyclopedia)Martin, Agnes (Agnes Bernice Martin), 1912–2004, American painter, b. Macklin, Canada. She moved to the United States in 1931, began painting in 1942,...

Kindelberger, Dutch

(Encyclopedia)Kindelberger, Dutch (James Howard Kindelberger), 1895–1962, b. Wheeling, W.Va., American aerospace pioneer. In 1917 he joined the army and went into the signal corps, serving as a pilot instructor. ...

Pohl, Frederik

(Encyclopedia)Pohl, Frederik (Frederik George Pohl, Jr.) pōl [key], 1919–2013, American science-fiction writer, b. New York City. Early in his career he often collaborated with other writers, particularly Cyril ...

Calypso, in astronomy

(Encyclopedia)Calypso, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XIV (or S14), Calypso is a small, irregularly shaped (nonspherical) body measuring about 21 mi (34...

vertigo

(Encyclopedia)vertigo vûrˈtĭgō [key], sensations of moving in space or of objects moving about a person and the resultant difficulty in maintaining equilibrium. True vertigo, as distinguished from faintness, li...