Research based on a 1.8 million-year-old skull shows that human evolution may have followed a straighter line than scientists previously thought. The skull, unearthed in the former Soviet republic of Georgia, is the most complete ever found of a human ancestor and marks the earliest evidence of human ancestors leaving Africa.

Research based on a 1.8 million-year-old skull shows that human evolution may have followed a straighter line than scientists previously thought. The skull, unearthed in the former Soviet republic of Georgia, is the most complete ever found of a human ancestor and marks the earliest evidence of human ancestors leaving Africa.

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