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Discussing the science fiction and fact of time travel. Guests: Christopher Lloyd, Michelle Gomez, and Michio Kaku.
Host Neil deGrasse Tyson interviews French high-wire artist Phillipe Petit, who gained fame for his high-wire walk between the Twin Towers of the World Trade Center in New York City, on the morning of August 7, 1974.
Host Neil deGrasse Tyson interviews theoretical physicist and bestselling author Brian Greene.