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Dr. Neil deGrasse Tyson
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Dr. Jared Diamond
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Burt Rutan
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Senator John Glenn
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John Krubski & Michael Connors with Ray Brady
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Dr. Robert Ballard & Jean-Michel Cousteau
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Neil Armstrong, Eugene Cernan & Dick Rutan with David Hartman
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Dr. Marc Micozzi & Dr. Victor McKusick with Patricia Cornwell
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Captain James Lovell & Dr. Frank Drake with James Burke
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Dr. Carl Sagan