A bank of video screens shows the progress of a simulated spacewalk as the crew of STS-135 trains in the Neutral Buoyancy Laboratory near NASA's Johnson Space Center in Houston March 10, 2011.
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Johnson Space Center
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NASA Photo/Houston Chronicle, Smiley N. Pool
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A bank of video screens shows the progress of a simulated spacewalk as the crew of STS-135 trains in the Neutral Buoyancy Laboratory near NASA's Johnson Space Center in Houston March 10, 2011.