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Bacon, Francis, English philosopher and statesman

(Encyclopedia) Bacon, Francis, 1561–1626, English philosopher, essayist, and statesman, b. London, educated at Trinity College, Cambridge, and at Gray's Inn. He was the son of Sir Nicholas Bacon,…

impotence

(Encyclopedia) impotenceimpotenceimˈpətəns [key], inhibited sexual excitement in a man during sexual activity that, despite an unaffected desire for sex, results in inability to attain or maintain a…

rickettsia

(Encyclopedia) rickettsiarickettsiarĭkĕtˈsēə [key], any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking…

tunicate

(Encyclopedia) tunicatetunicatet&oomacr;ˈnəkĭt [key], marine animal of the phylum Chordata, which also includes the vertebrates. The adult form of most tunicates (also called urochordates) shows…

DK Science & Technology: Machines

WHAT IS MECHANICAL ADVANTAGE? HOW IS A MACHINE’S EFFICIENCY MEASURED? LEVERSPULLEYSINCLINED PLANESGEARSFIND OUT MOREFrom can openers to cranes, machines make work easier. Simple machines include…

1999 World History

Thabo Mbeki (1942–) Eileen Collins (1956– ) NASA   1999 U.S. agrees to ease restrictions on Cuba (Jan. 4). Dennis Hastert elected to replace Newt…

transcontinental railroad

(Encyclopedia) transcontinental railroad, in U.S. history, rail connection with the Pacific coast. In 1845, Asa Whitney presented to Congress a plan for the federal government to subsidize the…