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Deep in a trench in Tanzania, researchers found dozens of tools crafted from animal bones some 1.5 million years old. By Carl Zimmer Humans, unlike most other species, have a knack for making tools.

The bone tools date from more than a million years before our species, Homo sapiens, arose around 300,000 years ago.

Elephant-bone tools were brought to the site from elsewhere, the investigators suspect. Bruce Bower has written about the behavioral sciences for Science News since 1984. He writes about ...

A total of 27 bone tools found at Tanzania's Olduvai Gorge Technology breakthrough is earlier than previously thought Researchers suspect tool maker was species Homo erectus The 27 tools ...