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Denisova Cave, site of paleoanthropological excavations in the Anui River valley roughly 60 miles (100 km) south of Biysk in the Altai Mountains of Russia. The cave contains more than 20 layers of excavated artifacts, indicating occupation by hominins as long ago as 280,000 years before the present to as recently as the Middle Ages. Evidence of 13 separate occupations occurring between 125,000 and 30,000 years ago is supported by the presence of artifacts from...