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2009., WGBH Boston Video Call No: LIfe Science Availability:0 of 1 At Location(s) Summary Note: "Nova investigates a provocative new theory that suggests the extinction of more than 34 types of large prehistoric mega-creatures, such as the saber-toothed cat and woolly mammoth, was caused not by climate change or the arrival of the first human hunters, but by the massive breakup of a comet over the Great Lakes region at the end of the last Ice Age, some 12,900 years ago." WGBH/Nova website.