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Pasteur, Louis

(Encyclopedia)Pasteur, Louis păstŭrˈ, Fr. lwē pästörˈ [key], 1822–95, French chemist. He taught at Dijon, Strasbourg, and Lille, and in Paris at the École normale supérieure and the Sorbonne (1867–89)....

Samuelson, Paul Anthony

(Encyclopedia)Samuelson, Paul Anthony, 1915–2009, American economist, b. Gary, Ind., grad. Univ. of Chicago (B.A., 1935), Harvard (M.A., 1936; Ph.D., 1941). Appointed a professor of economics at the Massachusetts...

triangle , in mathematics

(Encyclopedia)triangle, in mathematics, plane figure bounded by three straight lines, the sides, which intersect at three points called the vertices. Any one of the sides may be considered the base of the triangle....

Quine, W. V.

(Encyclopedia)Quine, W. V. (Willard Van Orman Quine) kwīn [key], 1908–2000, American philosopher and mathematical logician, b. Akron, Ohio, grad. Oberlin, 1930. He studied at Harvard (Ph.D., 1932) under Alfred N...

tektite

(Encyclopedia)tektite tĕktīt [key], naturally occurring, silica-rich (65%–80% SiO2) glass resembling obsidian and sometimes shale, and is normally jet black to olive green. They appear as small rounded or elong...

space-time

(Encyclopedia)space-time, central concept in the theory of relativity that replaces the earlier concepts of space and time as separate absolute entities. In relativity one cannot uniquely distinguish space and time...

Darwinism

(Encyclopedia)Darwinism, concept of evolution developed in the mid-19th cent. by Charles Robert Darwin. Darwin's meticulously documented observations led him to question the then current belief in special creation ...

Miller, Merton H.

(Encyclopedia)Miller, Merton H., 1923–2000, American economist, grad. Harvard, 1943, Ph.D. Johns Hopkins, 1952. A professor at Carnegie-Mellon Univ. (1953–61) and the Univ. of Chicago (1961–93), he developed ...

Menes

(Encyclopedia)Menes mēˈnēz [key], fl. 3200 b.c., king of ancient Egypt, of the first dynasty, the first Egyptian ruler for whom there are historical records. According to tradition, he seems to have united the s...

mechanism

(Encyclopedia)mechanism, philosophical theory about the nature of organic systems, holding that organisms are machines in the sense that they are material systems. Mechanism seeks to explain biological processes, i...