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Du Pont, Pierre Samuel

(Encyclopedia)Du Pont, Pierre Samuel, 1870–1954, American industrialist, b. Wilmington, Del., grad. Massachusetts Institute of Technology, 1890. Du Pont worked as a chemist with the family's company, helping to d...

Cherenkov radiation

(Encyclopedia)Cherenkov radiation or Cerenkov radiation [for P. A. Cherenkov], light emitted by a transparent medium when charged particles pass through it at a speed greater than the speed of light in the medium. ...

Yaroslav

(Encyclopedia)Yaroslav (Yaroslav the Wise) yərəslävˈ [key], 978–1054, grand duke of Kiev (1019–54); son of Vladimir I. Designated by his father to rule in Novgorod, he became grand duke of Kiev after defeat...

St. John, Oliver

(Encyclopedia)St. John, Oliver sĭnˈjən [key], 1598?–1673, English politician. He married (1638) a cousin of Oliver Cromwell. In 1637–38 he was, by his brilliant defense of John Hampden in the ship money case...

transportation

(Encyclopedia)transportation, conveyance of goods and people over land, across water, and through the air. See also commerce. The first practical attempts at air transportation began with the invention of the h...

Custer, George Armstrong

(Encyclopedia)Custer, George Armstrong, 1839–76, American army officer, b. New Rumley, Ohio, grad. West Point, 1861. In the reorganization of the U.S. army after the war Custer was assigned to the 7th Cavalry w...

Villa, Francisco

(Encyclopedia)Villa, Francisco fränsēsˈkō vēˈyä [key], c.1877–1923, Mexican revolutionary, nicknamed Pancho Villa. His real name was Doroteo Arango. When Villa came of age, he declared his freedom from the...

Kennedy, Joseph Patrick

(Encyclopedia)Kennedy, Joseph Patrick, 1888–1969, U.S. ambassador to Great Britain (1937–40), b. Boston, grad. Harvard, 1912. The founder of an American dynasty, he was the father of nine children, including Jo...

Indian art and architecture

(Encyclopedia)Indian art and architecture, works of art and architecture produced on the Indian subcontinent, which is now divided among India, Pakistan, and Bangladesh. In the Western world, notable collections of...

Helena, Saint

(Encyclopedia)Helena, Saint hĕlˈənə [key], c.248–328?, mother of Constantine I. She became a Christian in 313. According to tradition she found (327) the relic of the True Cross in Jerusalem and identified th...