Telling stories from stone tools

New approaches to categorizing stone tools aim to improve descriptions of hominid evolution

A stone tool

TOOL TIMING  Hand axes, such as this Acheulean tool, were made as early as 1.7 million years ago. They probably had multiple uses, much like a Swiss army knife.

Stone: J. Shea, Justin Pargeter/Stony Brook Univ.; Swiss Army tools: ljpat/iStockphoto, adapted by E. Otwell

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