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In fact, their extinction may have released the so-called Toba Bottleneck: most of the human race died off about 73,000 years ago, and numbers remained very low until about ten thousand years ago, during which time we began an unprecedented expansion that continues to this day. This bottleneck has traditionally been blamed on a massive volcanic explosion in Sumatra, and a consequent volcanic winter; but the timing is interesting, to say the least.

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