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Over 6.6 billion people inhabit the planet today. With all that, 70,000 years ago, no more than 2,000 people existed, as revealed by a new research carried out at Stanford University and published in the American Journal of Human Genetics. 70,000 years ago, our species was represented only by a small isolated African population, fighting to survive severe drought. "This study illustrates the extraordinary power of genetics to reveal insights into some of the key events in our species' hi... Read »