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quantum electrodynamics

(Encyclopedia)quantum electrodynamics (QED), quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the framework of quantum theory. ...

Grandmaster Flash and the Furious Five

(Encyclopedia)Grandmaster Flash and the Furious Five: see Rap music. ...

center of mass

(Encyclopedia)center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with the center of t...

Carloman, 751–71, son of Pepin the Short and brother of Charlemagne

(Encyclopedia)Carloman, 751–71, son of Pepin the Short. He and his brother, Charlemagne, shared the succession to their father's kingdom; Carloman ruled the southern portion. Attempts to end rivalry between the b...

Anaxagoras

(Encyclopedia)Anaxagoras ănˌəksăgˈərəs [key], c.500–428 b.c., Greek philosopher of Clazomenae. He is credited with having transferred the seat of philosophy to Athens. He was closely associated with many f...

Euler, Leonhard

(Encyclopedia)Euler, Leonhard lāˈônhärt oiˈlər [key], 1707–83, Swiss mathematician. Born and educated at Basel, where he knew the Bernoullis, he went to St. Petersburg (1727) at the invitation of Catherine ...

Renoir, Jean

(Encyclopedia)Renoir, Jean zhäN rənwärˈ [key], 1894–1979, French film director and writer, b. Paris; son of Pierre Auguste Renoir. He made his first film in 1926. Gathering around him a devoted coterie of act...

Bjerknes, Vilhelm Frimann Koren

(Encyclopedia)Bjerknes, Vilhelm Frimann Koren vĭlˈhĕlm frēˈmän kôˈrən byĕrkˈnĕs [key], 1862–1951, Norwegian physicist and pioneer in modern meteorology. He worked on applying hydrodynamic and thermody...

Kitt Peak National Observatory

(Encyclopedia)Kitt Peak National Observatory, astronomical observatory located southwest of Tucson, Ariz.; it was founded in 1958 under contract with the National Science Foundation and is administered by the Assoc...

Baum, L. Frank

(Encyclopedia)Baum, L. Frank (Lyman Frank Baum) bôm [key], 1856–1919, American journalist, playwright, and author of children's stories, b. Chittenango, N.Y. He and his family moved to South Dakota in 1888, wher...