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An astronaut gently plucked two protruding and potentially dangerous fiber strips from the space shuttle Discovery's underbelly Wednesday. The first American woman to walk in space weighs in on the repair job.

NASA announced Wednesday that all future shuttle flights would be grounded because the problem of foam peeling off the fuel tank -- and possibly damaging the shuttle during liftoff -- has not been eliminated. Two experts discuss the future of…

Scientists from the Center for Severe Weather Research track storms in western Kansas' "Tornado Alley" in an effort to improve their understanding of the process of tornado formation so that better predictions may someday be made.

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