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September 13, 2012
201107070003hq (7 July 2011) --- NASA Deputy Administrator Lori Garver gives a welcoming message at the STS-135 Tweetup at Kennedy Space Center July 7, 2011. About 150 NASA Twitter followers attended the event. The STS-135 mission will be NASA's last space shuttle flight. Photo credit: NASA/Paul E. Alers

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