The skull of this mature Kiffian male (L) is stained dark from high lake levels that inundated the cemetery at Gobero in the Sahara in Tenere Desert, Nigeria, in this undated photograph. The Kiffian was radiocarbon-dated at 9,500 years old. The Tenerian male (R) died in the prime of his life at about 18 years of age. The skull was radiocarbon-dated at 5,800 years old. A Stone Age graveyard on the shores of an ancient, dried-up lake in the Sahara is brimming with the skeletons of people, fish and crocodiles who thrived when the African desert was briefly green, researchers reported on Thursday. (Mike Hettwer ©2008 National Geographic /Handout/Reuters)
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