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Centers for Disease Control and Prevention

(Encyclopedia)Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. The ...

air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...

automatic frequency control

(Encyclopedia)automatic frequency control: see automatic tuning control. ...

automatic tuning control

(Encyclopedia)automatic tuning control (ATC), method or device to keep a radio or television receiver automatically tuned to a desired frequency or channel. Assuming that the receiver is at least approximately tune...

riot-control gas

(Encyclopedia)riot-control gas: see poison gas; tear gas. ...

Sanger, Margaret Higgins

(Encyclopedia)Sanger, Margaret Higgins, 1879–1966, American leader in the birth control movement, b. Corning, N.Y. Personal experience and work as a public-health nurse, much of it on New York City's Lower East S...

Stopes, Marie Carmichael

(Encyclopedia)Stopes, Marie Carmichael stōps [key], 1880–1958, British paleobotanist and eugenicist, b. Edinburgh, D.Sc. Univ. of London, Ph.D. Univ. of Munich. She lectured on paleobotany at the universities of...

pill, the

(Encyclopedia)pill, the: see birth control.

oral contraceptive

(Encyclopedia)oral contraceptive: see birth control. ...

contraception

(Encyclopedia)contraception and contraceptive: see birth control. ...