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    They could grind stones down to a sharp edge to make a blade. That said, this is not really a history question per se. Commented Jul 11, 2015 at 16:54
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    Obviously it's a history question, it happened in the past. Commented Jul 11, 2015 at 17:16
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    It happened in the pre-historical past. Commented Jul 11, 2015 at 17:25
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    It's still history. History is the study of the past. Commented Jul 11, 2015 at 18:14
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    @PichiWuana history is generally understood to be the analysis of the recorded past. Pre-history is distinct and involves different techniques. Archaeology uses a totally different body of technology, skills, knowledge and practice to study pre-history. The answer to your question may be found by researching Knapping Commented Jul 11, 2015 at 23:57