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Time Line End of Ice Age10 million (nomads) AD 0250 million (agriculture) 1650 (double 1)500 million (health care?) 1850 (double 2)1 billion 1940 (double.

Time Line End of Ice Age10 million (nomads) AD 0250 million (agriculture) 1650 (double 1)500 million...

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Released: December 25, 2015