Diamonds suggest comets caused killer cold spell
Sunday, January 4, 2009 - 18:28
in Paleontology & Archaeology
WASHINGTON (Reuters) - Tiny diamonds sprinkled across North America suggest a "swarm" of comets hit the Earth around 13,000 years ago, kicking up enough disruption to send the planet into a cold spell and drive mammoths and other creatures into extinction, scientists reported on Friday.