The flint tools, made using the Levallois technique, are identical to those used by both human groups. This technological uniformity indicates shared know-how rather than mere coexistence.

They said the tools had mainly been produced using the Levallois method, a distinctive technique for shaping and sharpening stone tools that was developed between 300,000 and 250,000 years ago.

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The flint tools, made using the Levallois technique, are identical to those used by both human groups. This technological uniformity indicates shared know-how rather than mere coexistence. The ...