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The discovery of 330 stone artifacts in Kenya that date back 2.9 million years is throwing light on a key question in human evolution — who first used stone tools? Scientists unearthed hammerstones, ...

The first stone tools that ancient humans made were deceptively simple. At least 2.6 million years ago, our ancestors learned to strike stones and break off sharp flakes that could function as knives.

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Excavations in an arid, hilly part of East Africa have uncovered 3.3-million-year-old stone tools, by far the oldest such implements found to date. Hominids at Kenya’s Lomekwi 3 site made rocks into ...