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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .The Sahara desert isn't known for its greenery.
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3 .But there's evidence it was once much lusher than today, dotted with water holes and lakes.
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4 .Now a study suggests that three massive rivers used to plough through the desert too, cutting pathways north to the Mediterranean coast.
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5 .Researchers used climate models to estimate rainfall more than 100,000 years ago.
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6 .They found that ancient monsoons formed 400 miles north of where they do today, spilling rain on mountains in the central Sahara.
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7 .That storm water would have drained north, powering three rivers the size of the Nile, and forming vast wetlands in what is now Libya.
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8 .The westernmost river, referred to as the Irharhar, was the most likely path for migrants,
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9 .and clusters of archaeological sites in Algeria and Tunisia back up that idea.
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10 .The analysis is in the journal PLoS ONE.
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11 .There's no telling whether humans made it to Europe by these routes.
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12 .But the alternatives were travelling along Africa's west coast, or up the Nile,
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13 .so these three ancient rivers would have offered a nice shortcut.
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14 .Now, of course, the waterways are buried beneath the dunes, along with any footprints our ancestors may have left behind.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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