Space Shuttle STS-121 Discovery sits on the launch pad after the roll back of the rotating service structure at the Kennedy Space Center in Cape Canaveral, Fla., Friday, June 30, 2006. The shuttle is scheduled for a Saturday afternoon liftoff. (AP Photo/John Raoux)AP - NASA chief Michael Griffin is taking a calculated gamble by going ahead with the launch of Discovery, overruling two top managers who fear foam flying off the fuel tank might harm the space shuttle.


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