Expedition 24 astronauts Tracy Caldwell Dyson and Douglas Wheelock work outside the International Space Station on Monday, Aug. 16, 2010, as they prepare to install a cooling pump module, replacing one that failed. (AP Photo/NASA)

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Expedition 24 astronauts Tracy Caldwell Dyson and Douglas Wheelock work outside the International Space Station on Monday, Aug. 16, 2010, as they prepare to install a cooling pump module, replacing one that failed. (AP Photo/NASA)