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camouflage

(Encyclopedia)camouflage kămˈəfläzh [key], in warfare, the disguising of objects with artificial aids, especially for the purpose of making them blend into their surroundings or of deceiving the observer as to ...

Pulitzer Prizes

(Encyclopedia)Pulitzer Prizes, annual awards for achievements in American journalism, letters, and music. The prizes are paid from the income of a fund left by Joseph Pulitzer to the trustees of Columbia Univ. They...

Fisk University

(Encyclopedia)Fisk University, at Nashville, Tenn.; coeducational; founded 1865, opened 1866, and chartered 1867. It became a university in 1967. Fisk, long an outstanding African-American school, is open to all qu...

Barnard's star

(Encyclopedia)Barnard's star, star with the largest observed proper motion (rate of motion across the sky with respect to other stars); located in the constellation Ophiuchus. The star's large proper motion, 10.28�...

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

fluid mechanics

(Encyclopedia)fluid mechanics, branch of mechanics dealing with the properties and behavior of fluids, i.e., liquids and gases. Because of their ability to flow, liquids and gases have many properties in common not...

Ptolemaic system

(Encyclopedia)Ptolemaic system tŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with a...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

Degas, Edgar

(Encyclopedia)Degas, Edgar (Hilaire Germain Edgar Degas) ēlĕrˈ zhĕrmăNˈ ĕdgärˈ dəgäˈ [key], 1834–1917, French painter and sculptor, b. Paris; son of a banker. Although prepared for the law, he abandon...

Penn, Irving

(Encyclopedia)Penn, Irving, 1917–2009, American photographer, elder brother of Arthur Penn, b. Plainfield, N.J.; studied Philadelphia Museum School of Industrial Art (now University of the Arts, 1934–38). Origi...