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Eve Explained: How Ancient Humans Spread Across the Earth

The greatest journey ever undertaken left behind a trail of unanswered questions: How did our species arise and spread around the globe to become the most dominant creature on the planet? Part of the answer came two decades ago, when scientists stunned the world with the finding, based on genetic research, that all humans alive today can claim as a common ancestor a woman who lived in Africa some 150,000 years ago — dubbed, inevitably, "Eve." But while the notion of an African origin of the human family has grown to be accepted by most scientists, the details of how Eve's ancestors swept out of Africa to populate the rest of the world have remained murky.

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