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;…
