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COSMOS: A SPACETIME ODYSSEY: Host Neil deGrasse Tyson explores why the great ancient civilizations perished in the all-new "The Immortals" episode of COSMOS: A SPACETIME ODYSSEY airing Sunday, May 18 (9:00-10:00 PM ET/PT) on FOX and Monday, May 19 (9:00-10:00 PM ET/PT) on Nat Geo.