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Last Extinction on PBS

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Fifteen thousand years ago North America was like the Serengeti on steroids, with mega-creatures roaming a continent teeming with incredible wildlife. But then, in a blip of geologic time, somewhere between 15 and 35 magnificent large types of animals went extinct. In a television exclusive, NOVA joins forces with prominent scientists to test a startling theory that may finally explain the Last Extinction, on Tuesday, March 31 at 8pm ET/PT on PBS (check local listings). The program features scientists representing all sides of this debate.