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Kirkwood gaps

(Encyclopedia)Kirkwood gaps, regions in the asteroid belt within which few asteroids are found. Astronomer Daniel Kirkwood first observed (1886) that few asteroids had an orbital period close to 1⁄2, 1⁄3, or 2�...

Heckman, James Joseph

(Encyclopedia)Heckman, James Joseph, 1944– American economist, b. Chicago, Ill., Ph.D. Princeton, 1971. He has taught at the Univ. of Chicago since 1973. Heckman shared the Nobel Memorial Prize in Economic Scienc...

Hackney

(Encyclopedia)Hackney, inner borough of Greater London, SE England, on the Lea River. Clothing manufacture (in Hackney) and printing and furniture making (in Shoredit...

Hardin, John

(Encyclopedia)Hardin, John, 1753–92, Native American fighter, b. Fauquier co., Va. He served in Lord Dunmore's War (1774) and was a noted member of Daniel Morgan's riflemen during the Revolution. His services at ...

Sheppard, Jack

(Encyclopedia)Sheppard, Jack, 1702–24, English criminal. Raised in a workhouse, he ran away with Bess Lyon, known as Edgeworth Bess, who, with another girl known as Poll Maggott, incited him to a short but specta...

Smith, Hamilton Othanel

(Encyclopedia)Smith, Hamilton Othanel, 1931–, American biologist, b. New York City, M.D. Johns Hopkins, 1956. A professor at the Univ. of Michigan and Johns Hopkins, Smith worked with Daniel Nathans and Werner Ar...

Webster

(Encyclopedia)Webster, town (1990 pop. 16,196), Worcester co., S Mass., near the Conn. line; settled c.1713, set off from Dudley and Oxford and inc. 1832. The chief manufactures are clothing, lenses, fabrics, and t...

Lessing, Gotthold Ephraim

(Encyclopedia)Lessing, Gotthold Ephraim gôtˈhôlt āˈfräĭm [key], 1729–81, German philosopher, dramatist, and critic, one of the most influential figures of the Enlightenment. He was connected with the theat...

Cooper, Gary

(Encyclopedia)Cooper, Gary, 1901–61, American film actor, b. Helena, Mont., as Frank James Cooper. His first important starring role in A Farewell to Arms (1933) was followed by such films as Mr. Deeds Goes to To...

time and motion study

(Encyclopedia)time and motion study, analysis of the operations required to produce a manufactured article in a factory, with the aim of increasing efficiency. Each operation is studied minutely and analyzed in ord...