Space shuttle Endeavour crew (L - R) pilot Charles Hobaugh, mission specialist Rick Mastracchio, commander Scott Kelly, mission specialist's Tracy Caldwell, Barbara Morgan and Canadian Space Agency astronaut Dave Williams walk out of crew quarters during a launch dress rehearsal at Kennedy Space Center in Cape Canaveral, Florida July 19, 2007. The space shuttle Endeavour is scheduled to launch on August 7 on a mission to the International Space Station. [Reuters]

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