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Skull, Australopithecus prometheus, South Africa(Courtesy the University of the Witwatersrand)
A new dating technique is making it easier for paleoanthropologists to study the human evolutionary record by making it possible to date a wider range of stones and sediments. A team of scientists, including Darryl Granger of Purdue University, has looked to aluminum-26 and beryllium-10, isotopes that are created when rocks are out in the open, exposed to cosmic rays. Once the rocks are buried, the
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