Meteor May Have Wiped Out Middle East Civilization
GFD writes "The Telegraph has a story about how a recently discovered impact crater in Iraq could have wiped out several civilizations that 'collapsed mysteriously' about 4000 years ago. This is the first find, AFAIK, of a meteor impact affecting human civilization directly. Very thought provoking."
The relevant books are things like Ages in Chaos, Worlds in Collision and Earth in Upheval.
OS/2 - because choice is a terrible thing to waste.