Quantifying Oldowan Stone Tool Production at Olduvai Gorge, Tanzania.

PLoS One · 2016 · PMC4726611 · PMID 26808429

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a clear trendno p-value reported

DK basalt flakes falling outside of expected variation demonstrate a clear trend of being produced in an economically inefficient manner.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.