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An ancient hand axe was shaped on both sides

Unlike Oldowan tools, Acheulean tools actually look like tools. Acheulean tools are distinct from Oldowan tools in that they were modified on both sides, resulting in a symmetrical tool with two faces, also known as biface.

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OpenStax · Introduction to Anthropology · Tools and Brains: Homo habilis, Homo ergaster, and Homo erectus ↗ (opens in a new tab)

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