NatGeo 2007
NatGeo 2008
NatGeo 2013
Did a Comet Really Kill the Mammoths 12,900 Years Ago?
Did the planetary upheaval 12,900 years ago come from the heavens—or Earth?
Robert Kunzig
National Geographic
Published September 10, 2013
Why did mammoths, mastodons, and other mega-beasts vanish from North America?
Was it because:
1) humans killed them;
2) they couldn’t hack the climate after the…
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