NOVA Last Extinction
Scientists propose a radical idea of what killed off mammoths and other Ice Age animals. Details
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End of the Big Beasts
Overhunting, climate change, disease, and now a comet. What did kill off the megafauna?
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The Extinction Debate
Follow the heated, decades-long controversy over North America's Ice Age extinctions.
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Modeling a Comet Airburst
In this video clip, see why an explosion three miles above Earth would act like a white-hot tornado on the surface.
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Stone Age Toolkit
Would you know how to use an ancient stone tool if you unearthed one? Try your hand here.
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