People love finding out that they have a famous relative, or they’re descended from royalty. Thanks to genetic testing services like 23AndMe, it’s easy to send your spit away and get a rundown of your potentially regal DNA. But being related to long-ago kings doesn’t make us special—it just makes us human.
What happens if you let a genome hacker—a kind of computer scientist-turned-biologist—loose on the world's online genealogy sites? The world's biggest family tree is what, which shows how over 13 million people are related.