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An unheated piece of silcrete stone, left, is contrasted with an ancient stone tool that was shaped from silcrete. The stone changed color and texture after being heated and chipped into an implement. New analyses of such artifacts suggest the technology of using heat to make tools was being used in Africa at least 72,000 years ago. Credit: Brown/South African Coast Paleoclimate, Paleoenvironment, Paleoecology, Paleoanthropology Project

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