Death of the Megabeasts

6:00pm

In May of 2008, a scientific team made headlines by announcing evidence that a previously unsuspected impact from space had devastated prehistoric North America at the end of the last Ice Age. Nova takes a look at this new theory that states that the extinction of more than 34 types of large mammoths was not due to climate change or human hunters, but rather by the massive breakup of a comet over the Great Lakes region.