Barack Obama says you won't catch him lighting up a cigarette in the smoke-free White House.
Almost one in five young American adults has a personality disorder that interferes with everyday life, and even more abuse alcohol or drugs, researchers report.
Congress has approved a bill that calls for a feasibility study on a passenger high-speed rail service between Little Rock and Memphis, Tenn.
As puberty kicks in �for the first children born to infertile men helped with a revolutionary technique, scientists anticipate seeing boys who've inherited the problems of their fathers.
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