Labor Day Weekend for Astronauts: Space Toilet Cleaning and Exercise

Labor Day Weekend for Astronauts: Space Toilet Cleaning and Exercise
American astronauts Doug Wheelock, Tracy Caldwell Dyson (center) and Shannon Walker, all NASA spaceflyers and Expedition 24 flight engineers, pose for a photo with an American flag while aboard the International Space Station during their summer 2010 mission.
(Image: © NASA)

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