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Deep African roots for toolmaking method

Stone-trimming technique originated earlier than thought, archaeologists contend

2:02pm, October 28, 2010

Stone-tool makers living in southern Africa 75,000 years ago pushed the cutting edge in more ways than one. These intrepid folk sharpened the thin tips of heated stone spearheads using a forceful technique previously dated to no more than 20,000 years ago, a new study finds.

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