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cliffelam · 4641 days ago · link · · parent · post: Hubski poll - Top Ten Disasters in the History of Man
Totally correct, brain damage from talking to a curious 10 year old while trying to coax my old man brain into a list. I'd intended to go find out which ice age took the pre-human species down to just a few hundred breeding pairs. Not at my computer right now, will go look that up shortly.
I'm fairly sure you're thinking of the Toba supervolcano. http://en.wikipedia.org/wiki/Toba_catastrophe_theory
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