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cosmology

(Encyclopedia)cosmology, area of science that aims at a comprehensive theory of the structure and evolution of the entire physical universe. The earliest pre-Ptolemaic theories assumed that the earth was the cent...

continental drift

(Encyclopedia)CE5 Continental drift (arrows indicate the directions of motion of the landmasses) A. Proposed reconstruction of the supercontinent Pangaea indicating the major present landmasses B. Proposed recon...

integer

(Encyclopedia)integer: see number; number theory. ...

political science

(Encyclopedia)political science, the study of government and political processes, institutions, and behavior. Government and politics have been studied and commented on since the time of the ancient Greeks. However...

ideal gas

(Encyclopedia)ideal gas: see gas laws; kinetic-molecular theory of gases. ...

Leucippus

(Encyclopedia)Leucippus lo͞osĭpˈəs [key], 5th cent. b.c., Greek philosopher. Aristotle believed that Leucippus inspired the atomistic theory with which Democritus is identified. Little is known about Leucippus....

Lowie, Robert Harry

(Encyclopedia)Lowie, Robert Harry, or Robert Heinrich Lowie lōˈē [key], 1883–1957, American anthropologist, b. Vienna, grad. College of the City of New York, 1901, Ph.D. Columbia, 1908. He was on the staff of ...

Klein, Christian Felix

(Encyclopedia)Klein, Christian Felix klīn [key], 1849–1925, German mathematician. He is noted for his work in geometry and on the theory of functions. His Erlangen program (1872) for unifying the diverse forms ...

Klein, Melanie

(Encyclopedia)Klein, Melanie, 1882–1960, British psychoanalyst, b. Vienna. She became a psychoanalyst after seeking therapy from Sandor Ferenczi, a colleague of Sigmund Freud, who encouraged her to pursue her own...

Sargent, Thomas John

(Encyclopedia)Sargent, Thomas John, 1943–, American economist, b. Pasadena, Calif., Ph.D. Harvard (1968). He has been on the faculty at the Univ. of Pennsylvania (1970–71), Univ. of Minnesota (1971–87), Univ....