In recent years, genome sequencing has changed everything we thought about our origins and how we relate to early human species

For David Reich, research can be a harrowing experience. The 44-year-old Harvard University geneticist says he now goes to bed terrified he will wake up to find his team’s recent, stunning discoveries about human ancestry have been proved wrong. “We are now making so many startling insights I sometimes fear it must all be incorrect,” he says.

To be fair to Reich, no one has yet found any hint his results are invalid. “That still doesn’t stop me worrying,” he insists.

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