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Developed by three young software-engineering students at the University of Iceland, it lets users instantly compare their lineage by bumping their mobile devices together. The app includes an "incest-prevention alarm," says Arnar Freyr Adalsteinsson, one of the developers. "When you bump, it shows your nearest common ancestors. If you bump with someone who's too closely related, you get an alarm sound and a text warning."

That's right, a country where people are so similar you need a mobile app to tell you if your drunk booty call is a relative.