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In 2000, Paul Sereno of the University of Chicago went to the Sahara looking for dinosaur bones. Instead he found the largest known graveyard of Stone Age people. Here, Dr. Sereno is working to stabilize the skull of a woman of a nomadic culture knowns as the Tenerians, who lived in the area in Niger from 6,500 to 4,500 years ago, when rains fell and lakes dotted the Sahara.

Michael Hettwer