Science: The Sahara's Buried Rivers

Columbia space shuttle uses radar as a time machine

It is a hostile wasteland of flat sands and marching dunes, where the temperatures have soared to 122° F, and the rain falls only once in 30 to 50 years. But for thousands of years, there have been tales that the Sahara's arid surface concealed a "large river without water." Last week a team of scientists from the U.S. and Egypt announced that they had definitive evidence that long ago a region of the vast desert in southern Egypt and northern Sudan was a lacy network of...

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