[Loki]

http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=1552&mode=thread&order=0&thold=0

Best read !



Scientists can recite a long list of the devastating environmental consequences of a large meteorite impact, but they cannot prove these effects have led to the simultaneous loss of life around the globe. Answering the question of how and why such a large variety of species died out at the same time is one of the greatest mysteries in paleontology.