IN THE LAST 20 years, genealogy websites have attracted more than 15 million customers by promising insights into your past. It’s deeply personal, affecting stuff. But when your family tree contains thousands, millions, even tens of millions of people, it’s no longer a personal history. It’s human history. Recently, scientists from the New York Genome Center, Columbia, MIT, and Harvard scraped crowdsourced public records into family trees the size of small nations. Their analysis, which was published today in Science, includes the single largest known family tree, containing 13 million people. Your cousins Jeff and Anthony discuss this story.

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Today’s story: https://www.wired.com/story/researchers-used-this-genealogy-site-to-build-a-13-million-person-family-tree/

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