A new study says a huge comet exploding over Canada 11,000 years ago finished off the Woolly Mammoth -- and possibly annihilated the Clovis Culture as well. That's not the kind of globe-girdling impact that killed off all the dinosaurs but quite big enough to eliminate human culture as we know it in most of the northern hemisphere. Dinosaur-killing events aren't supposed to happen more than every 20 or 30 million years, but one wonders... what about Mammoth-killing events?
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