Ron Garan Tweetup

Astronaut Ron Garan, far right, discusses his experiences while living on the International Space Station as part of the Expedition 27 and 28 mission during a tweetup at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan has logged more than 178 days in space and 27 hours and 3 minutes of EVA in four spacewalks. Photo Credit: (NASA/Carla Cioffi)