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Peggy Whitson's advice to aspiring astronauts: "Live outside what's comfortable"

Former NASA astronaut Peggy Whitson first dreamed of going to space when she saw Neil Armstrong take the first step on the moon. Whitson spent a record 665 days in space. That’s more than any other American in history. She joins "CBS This Morning" co-host Tony Dokoupil at the Kennedy Space Center for the 50th anniversary of the Apollo 11 launch.

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