Barras highlights Albert Perry's bewildering ancestry. One possible explanation for Perry's bewildering ancestry is that hundreds of thousands of years ago, modern humans interbred with a species that is now extinct. A man gets his Y chromosome from his father, who in turn got his from his father, and so on. Trace every man's father-son lineage far enough back in time and they all converge on one individual who--calculations show--lived between 60,000 and 140,000 years ago.
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