Humans first arrived in North America 10,000 years earlier than previously thought, according to an analysis of ancient animal bones found in northern Yukon, Canada. Top: cut marks on a horse mandible from Bluefish Cave II; the specimen is dated to 19,650 years before present; the bone surface is a bit weathered and altered by root etching but the cut marks are well preserved; they are located on the medial side, under the third and second molars,...
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