Expedition 20 Flight Engineers Jeff Williams, left, and Nicole Stott are seen during a live broadcast from the International Space Station (ISS) as they answer questions from NASA Twitter followers at NASA Headquarters in Washington, on what it is like to live and work in space, Wednesday, Oct. 21, 2009. Photo Credit: (NASA/Carla Cioffi) NASA ISS Tweetup 2009-10-21

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