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Associated Press
In this Tuesday, July 21, 2015 photo, visitors look over display cases at the "Forever Remembered" exhibit and memorial for the astronauts that perished on the Columbia and Challenger space shuttles, at the Kennedy Space Center Visitor Complex in Cape Canaveral, Fla. NASA's intent is to show how the astronauts lived, rather than how they died. (AP Photo/John Raoux)

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