Word: acheulean
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...technological advance that could plausibly have done the trick. Excavations of sites dating back 1.4 million years B.P., 4,000 centuries after H. erectus first appeared, uncovered multifaceted hand axes and cleavers much more finely fashioned than the simple stone tools used before. These high-tech implements are called Acheulean tools, after the town of St. Acheul, in France, where they were first discovered. With better tools, goes the theory, H. erectus would have had an easier time gathering food. And within a few hundred thousand years, the species moved beyond Africa's borders, spreading first into the Middle East...
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