Humans may have emerged as a distinct species as early as 350,000 years ago, according to a new study. DNA from the skeleton of a boy who lived in what's now South Africa may be the best benchmark so far for gauging when Homo sapiens originated in Africa.

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Humans may have emerged as a distinct species as early as 350,000 years ago, according to a new study. DNA from the skeleton of a boy who lived in what's now South Africa may be the best benchmark so far for gauging when Homo sapiens originated in Africa.