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[探索发现] 【整理】2010-02-19 地球的起源 EarthMade—9

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Nick D gets word that in 2009, archeologists have just made an important discovery that supports the river theory, stone tools found not far from the side of the mega lake in Tunisia, the first step is to identify the shoreline of the ancient lake.
Oh, this is, looks good, so you’ve got some fresh water mollusks.
These tiny shells are good sign of the lake, now he searches for what may have been drinking the water when the mage lake existed.
Ever, what looks like a, part of jawbone, of a small herbivore, you see three teeth running along there, something of a gazelle.
So animals must have existed here in the desert when it was green
Ok, we got a stone tool here, it’s becoming blunt and retouched with a lot of free fine flakes of the edge. A fact we got stone tool and we got dead animal, suggest hunting, and this was animal that had been hunted, and then we got water so people sitting around a water hole, waiting for animal comes to drink, and then killing them eating them leaving them behind.
It is an important find, a Stone Age tool shows people lived on the shore of this ancient lake, and 90,000 years ago was a turning point not just in the story of the Sahara but the history of humanity itself, we are all descended from one group of people in east Africa, the birth place of humankind. Sometime between 80,000 and 120000 years ago, modern humans started the long journey out of Africa, no one knows for certain what route they took. The prevailing view is that the Sahara was impassable, so humans left the east Africa and traveled to the coast, then across the a land bridge into the Arabian Peninsula. But D suspects that if the mega lakes were fed by a river system, it would have created a green corridor across the burning sands.
So, our ancestors could follow this river system, gone around the lakes, follow the next the river system, around the next river system, and next river system and the last lake and then they’ll in north Africa, and we simple for them to just move out, a lake is a good story, the rivers plus the lake is a very concrete story.
Define proof of this theory, D heads to the one of few areas in the desert where water still flows, an oasis.
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