The genomes of the long dead are turning up all sorts of unexpected and controversial findings.
Geneticist David Reich used to study the living, but now he studies the dead.
The precipitating event came in the form of 40,000-year-old Neanderthal bones found in a Croatian cave. So well-preserved were the bones that they yielded enough DNA for sequencing, and it became Reich’s job in 2007 to analyze the DNA for signs that Neanderthals interbred with humans—a idea he was “deeply suspicious” of at the time.
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