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DK Science: Pitch

HEARING ABILITYDOPPLER EFFECTULTRASOUNDFIND OUT MORESound can be low-pitched, like the rumble of a large truck, or high-pitched, like a whistle. The pitch of a sound depends on the frequency of…

William C. Durant

manufacturerBorn: 12/8/1861Birthplace: Boston, Mass. He quit high school to begin work in his grandfather's Flint, Michigan, lumberyard. By 1885 he had organized the Flint Road Cart Company, which…

Emergency cords

The Question: Why do trains have emergency cords available to the public? Is there EVER a case where a passenger pulling the cord would be the right course of action…

DK Science: Molecules

VARIETY OF MOLECULESSIMPLE MOLECULECOMPLEX MOLECULEBONDINGCHANGING MOLECULESFIND OUT MOREMost atoms join up with other atoms through chemical BONDS to form larger particles called molecules. They…

Rubin, Robert Edward

(Encyclopedia) Rubin, Robert EdwardRubin, Robert Edwardr&oomacr;ˈbĭn [key], 1938–, U.S. business executive and government official, b. New York City. A graduate of Harvard, he attended the London…

Beaverbrook, William Maxwell Aitken, 1st Baron

(Encyclopedia) Beaverbrook, William Maxwell Aitken, 1st Baron, 1879–1964, British financier, statesman, and newspaper owner, b. Canada. The son of a Scottish Presbyterian clergyman, he grew up near…

Close, Glenn

(Encyclopedia) Close, Glenn, 1947–, American actress, b. Greenwich, Conn. She began her career in the theater, debuting on Broadway in Love for Love (1974), winning an Obie for the off-Broadway The…