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5 of 20 from Alan Shepard's landmark space flight (photos)
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The physical exam, which included standard blood pressure and temperature checks, took place at 2:40 a.m. ET, according to NASA. At this point in history, no one outside of Yuri Gagarin and probably just a few others associated with the Soviet space program knew for sure what the effects would be on a person traveling outside the atmosphere.
May 5, 2011 4:00 AM PDT
Photo by: NASA
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