Rewind time 100,000 years ago: several different species of humans co-exist on earth.There was, of course, our own species, Homo sapien, but we were joined by our more athletic siblings from the Tree of Life, Homo erectus, who had left Africa and colonized Asia long before we ventured beyond the mother continent, all the while another sibling, the stocky Neanderthal, was hunkered down in a European ice age.

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