Discovery: The Fossil Jaw of Homo

In 2013, a research team was working in the dusty hills of Ledi-Geraru, Ethiopia. The geologists identified a layer of sediment, or dirt, as belonging to the time period they were trying to study. The scientists hoped to find fossils from this time period. They got very lucky and found an important new fossil that helps to fill in a period of history in human evolution.

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When did human ancestors use stone tools?
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