By Will Dunham (Reuters) -The Sahara Desert is one of Earth's most arid and desolate places, stretching across a swathe of North Africa that spans parts of 11 countries and covers an area ...

The Sahara Desert is one of Earth's most arid and desolate places, stretching across a swathe of North Africa that spans parts of 11 countries and covers an area comparable to China or the United ...

But the Green Sahara people carried only trace amounts of Neanderthal DNA, illustrating that they had scant contact with outside populations. Although the Takarkori population itself disappeared ...