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The Great Filter theory suggests humans have already conquered the threat of ... - io9

http://io9.com/5970501/the-great-filter-theory-suggests-humans-have-already-conquered-the-threat-of-extinction

It's a notion that's often invoked to explain why we've never been visited by extraterrestrials. But there is another possible reason for the celestial silence. Yes, the Great Filter exists, but we've already passed it. Here's what this would mean ...

Submitted in section: Paranormal news 2012: The Great Filter theory suggests humans have already conquered the threat of ... - io9

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