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electrodynamics

(Encyclopedia)electrodynamics, study of phenomena associated with charged bodies in motion and varying electric and magnetic fields (see charge; electricity); since a moving charge produces a magnetic field, electr...

Dallas, George Mifflin

(Encyclopedia)Dallas, George Mifflin, 1792–1864, American statesman, vice president of the United States (1845–49), b. Philadelphia; son of Alexander James Dallas. He read law, was admitted (1813) to the bar, a...

Clement VII, pope

(Encyclopedia)Clement VII, c.1475–1534, pope (1523–34), a Florentine named Giulio de' Medici; successor of Adrian VI. He was the nephew of Lorenzo de' Medici and was therefore first cousin of Pope Leo X. In 151...

extradition

(Encyclopedia)extradition ĕkstrədĭshˈən [key], delivery of a person, suspected or convicted of a crime, by the state where he has taken refuge to the state that asserts jurisdiction over him. Its purpose is to...

facsimile

(Encyclopedia)facsimile făksĭmˈəlē [key] or fax, in communications, system for transmitting pictures or other graphic matter by wire or radio. Facsimile is used to transmit such materials as documents, telegra...

humor

(Encyclopedia)humor, according to ancient theory, any of four bodily fluids that determined human health and temperament. Hippocrates postulated that an imbalance among the humors (blood, phlegm, yellow bile, and b...

Gates, Robert Michael

(Encyclopedia)Gates, Robert Michael, 1943–, American government official, U.S. secretary of defense (2006–11), b. Wichita, Kans. A circumspect and pragmatic career intelligence officer, he joined (1966) the Cen...

jerboa

(Encyclopedia)jerboa jərbōˈə [key], name for the small, jumping rodents of the family Dipodidae, found in arid parts of Asia, N Africa, and SE Europe. Jerboas have extremely long hind feet and short forelegs; t...

Johnson, Boris

(Encyclopedia)Johnson, Boris (Alexander Boris de Pfeffel Johnson), 1964–, British political leader, b. New York City, grad. Oxford (1986). While at Oxford Johnson was president of the prestigious Oxford Union deb...