Three mighty rivers once flowed through the Sahara

The world's most famous desert isn't always quite so dry as it is now—thanks to the Earth shifting on its axis, the Sahara's climate gets gradually greener over tens of thousands of years. But you'd have to go back a long ways to find real, perennial rivers flowing through the Sahara outside of the Nile. But 100,000… » 9/15/13 11:00am 9/15/13 11:00am

What Happened to the Mysterious Humans of the Sahara 7,000 Years Ago?

The Sahara in central Africa is the largest hot desert on Earth, its blistering sands practically lifeless. But just a few thousand years ago, it was a home to early human civilizations. Over the past decade, we've gotten a sharp picture of what happened to the people who lived in this lost landscape. » 6/24/13 5:25pm 6/24/13 5:25pm