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If you don't know about his connection to Joan Rivers, or where he stands on the "is a hot dog a sandwich" debate, do you really know Neil deGrasse Tyson? Stephen finds out what makes America's favorite astrophysicist tick in this edition of The Colbert Questionert.\nWe want your feedback on The Late Show Pod Show with Stephen Colbert! Visit\xa0http://www.colbertlateshow.com/podsurvey\xa0to take a brief survey.\nLearn more about your ad choices. Visit megaphone.fm/adchoices