Researchers use climate models to estimate rainfall more than the 100,000 years ago, they found the ancient * formed four hundreds miles north of where they do today, spreading rain on the mountains and central Sahara, that storm water would have drained north powering three rivers the size of the Nile and forming vast wetland in what is now Libya.  The west most river, referred to as the * was the most likely pass for migrants and clusters of archaeological sites in * and * back up to that idea, the analysis is in the journal Plus One. There is no telling whether humans made it to Europe by these routes, but the alternatives were traveling along the Africa's west coast or up the Nile. So these  rivers would offer a nice shortcut, now of course, the waterways with buried beneath the dooms, along with any foot prints our ancestors may have left behind. Thanks for the minute, for Scientific American 60 Seconds Science, I'm Christopher Intagliata.