Megabeasts' Sudden Death: Scientists propose a radical new idea of what killed off mammoths and other large animals at the end of the Ice Age. Airs on PBS March 31, 2009
End of the Big Beasts

End of the Big Beasts
Overhunting, climate change, disease, and now a comet. What did kill off the megafauna?

Extraordinary Artifacts

Extraordinary Artifacts
Ten exquisite Clovis stone tools reveal the artistry of America's early flintknappers.

Modeling a Comet Airburst

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.

Stone Age Toolkit

Stone Age Toolkit
Would you know how to use an ancient stone tool if you unearthed one? Try your hand here.

Before Clovis

Before Clovis
Were people in North America long before the so-called "first Americans"? Explore an interactive map.

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