Where did the human species originate?



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    A joint study between IBM and National Geographic points to a single African ancestor that links all current humans. The man in charge is Spencer Wells, who “has traveled the world, collecting blood samples from people of far-flung cultures: Aborigines in Australia, the Chukchi tundra dwellers of Siberia, farmers in the hills of Afghanistan, and nomads in the deserts of Africa. By studying the DNA of modern humans, he seeks to learn who we are, where we traveled to populate the world, and how closely we are all related. ”

    By analyzing genetic changes in the Y-chromosome of people in all regions of the world, Wells and colleagues concluded that all humans alive today are descended from a single African man.

    “We’re all effectively cousins, separated by 2,000 generations,” he said.

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