Scientists find signs of 13,000-year-old extinction event

Scientists find signs of 13,000-year-old extinction event. First an explosion as powerful as thousands of megatons of TNT rained meteorites down on North America . Then forest fires broke out across the continent, sending up a thick layer of soot and dust that blocked out the sun. A sudden ice age ensued, and some of the Earth's largest animals went extinct in a blink of geological time. It's well-known that a meteorite colliding with Earth is considered the most likely reason why dinosaurs died off 65 million years ago. Now a team of scientists says it has found new evidence that a comet triggered a similar extinction much more recently: 13,000 years ago, when humans were around to witness the event and suffer its terrible consequences