ANSWER:It was about 15 thousand yeas ago, but tough to nail down. There was little ice left by 10,000 ago when the last people were able to cross the Bering Strait from Russia to Alaska. Ice ages forced intelligence to develop more, in that the dumb ones died and the smart ones (that could adapt), lived and propagated. We are still coming out of an ice age, which is why it is slightly warming, but sooner than later it will cool again and wipe out most life unless you are by the equator.

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