STS-135 crew members Commander Chris Ferguson, left, and Mission Specialist Sandy Magnus, talk about their experiences aboard the final flight of Space Shuttle Atlantis during a Tweetup, Thursday afternoon, Oct. 13, 2011, at NASA Headquarters in Washington. About 150 NASA Twitter followers participated in the event. Photo Credit: (NASA/Paul E. Alers)
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STS-135 crew members Commander Chris Ferguson, left, and Mission Specialist Sandy Magnus, talk about their experiences aboard the final flight of Space Shuttle Atlantis during a Tweetup, Thursday afternoon, Oct. 13, 2011, at NASA Headquarters in Washington. About 150 NASA Twitter followers participated in the event. Photo Credit: (NASA/Paul E. Alers)
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