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What nature has covered up, humans have again exposed. Using images from the Spaceborne Imaging Radar C/X-band Synthetic Aperture Radar (SIR-C/X-SAR), researchers have found remnants of two generations of the Great Wall of China buried beneath desert sands, 700 km west of Beijing. Erosion and wind storms had shielded parts of both walls from view, but the foundation now has been laid bare by remote sensors.