Daily grind: The biography of a stone axe

Tom Breukel analysed some 250 stone axes from the Caribbean and reconstructed their biographies, thus increasing our knowledge of production and trade in the period around the arrival of Columbus. His Ph.D. defence is on ...

Intrinsic properties—the secret lives of accelerometers

When different laboratories test the same accelerometer, such as the one in your smartphone, they often come up with very different values. There are several possible reasons: Perhaps the axes of the gimbal system used in ...

Our hominid ancestors made and used tools

Neil Norman found the tools when he and Bruce Larson were walking down the local wadi, a usually dry watercourse that hadn't moved much in a long, long time.

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