Research published in the Proceedings of the National
Academy of Sciences finds evidence of a major cosmic event near the end of the
Ice Age. The ensuing climate change forced many species to adapt or die.
Herds of wooly mammoths once shook the earth beneath their
feet, sending humans scurrying across the landscape of prehistoric Ohio. But
then something much larger shook the Earth itself, and at that point these mega
mammals’ days were numbered.