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Practice Makes Perfect EVAs

Astronauts Cady Coleman and Suni Williams conducted an underwater practice spacewalk session at Johnson Space Center's Neutral Buoyancy Laboratory August 2. The session was to help International Space Station team members identify challenges Expedition 24 astronauts Doug Wheelock and Tracy Caldwell Dyson may encounter on the first of two planned spacewalks later this week to replace a failed ammonia pump module that helps cool the orbiting complex. The spare replacement unit was delivered to the station on the STS-121 mission in July 2006.
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