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An examination over whether a comet struck the Great Lakes region 12,900 years ago, and whether it caused the extinction of such mega-creatures as the woolly mammoth and the saber-toothed cat in North America. Also included is the discovery of nano-diamonds which are created by heat and objects from space.
First Air Date : Mar 03, 1974
Last Air date : Apr 29, 2026
Episode : 1020 Episode
Season : 53 Season
Runtime: 55:14 minutes
Studio: PBS
Country: United States of America
Cast:
Crew:
