The discovery of stone tools dating to 71,000 years ago at a site in South Africa suggests that the humans making them had developed the capacity for complex thought, and passed this knowledge down the generations. See Letter p.590
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*This article and the paper under discussion1 were published online on 7 November 2012.
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McBrearty, S. Sharpening the mind. Nature 491, 531–532 (2012). https://doi.org/10.1038/nature11751
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