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X ray

(Encyclopedia)CE5 Typical X-ray composite spectrum (intensity as a function of frequency) X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visibl...

geology

(Encyclopedia)geology, science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably statistics) for suppor...

water

(Encyclopedia)CE5 A. Water molecule (black circles represent valence-shell electrons) B. Structure of ice: Each oxygen atom (white circles) is bonded to four other oxygen atoms by hydrogen bonds, the hydrogen at...

Quetzalcoatl

(Encyclopedia)Quetzalcoatl kĕtˌsälkôätˈəl [key] [Nahuatl,=feathered serpent], ancient deity and legendary ruler of the Toltec in Mexico. The name is also that of a Toltec ruler, who is credited with the disc...

liverwort

(Encyclopedia)liverwort, any plant of the class Marchantiopsida. Mosses and liverworts together comprise the division Bryophyta, primitive green land plants (see moss; plant); some of the earliest land plants resem...

Lehn, Jean-Marie

(Encyclopedia)Lehn, Jean-Marie zhäNˈ-märēˈ lĕN [key], 1939–, French chemist, Ph.D. Univ. of Strasbourg, 1963. A professor at Louis Pasteur Univ. (1970–78) and the Collège de France (1979–), Lehn did gr...

Karplus, Martin

(Encyclopedia)Karplus, Martin, 1930–, Austrian-American theoretical chemist, b. Vienna, Ph.D. California Institute of Technology, 1953. He has been a professor at Harvard since 1967, studying the electronic struc...

Nagel, Ernest

(Encyclopedia)Nagel, Ernest, 1901–85, American philosopher, b. Nové Město (now in the Czech Republic), grad. College of the City of New York, 1923, and Columbia (Ph.D., 1930). His family emigrated to the United...

Mulisch, Harry

(Encyclopedia)Mulisch, Harry mo͞oˈlĭsh [key], 1927–2010, Dutch writer. In the 1960s Mulisch became a prominent member of Amsterdam's new left. He was extremely prolific, writing fiction, nonfiction, and poetry...

Hirsch, Samson Raphael

(Encyclopedia)Hirsch, Samson Raphael, 1808–88, German rabbi and chief exponent of Neo-Orthodoxy. As rabbi in Frankfurt-am-Main, he advocated the organization of autonomous Orthodox congregations outside the state...