For every face there are seven doppelgängers. Leading experts test several non-related 'twins'. Is there more to the phenomenon than pure coincidence?
Ever wondered if there's someone out there who looks exactly like you? More and more people do and this curiosity is fuelling a huge global phenomenon of people searching for their doppelgängers.
Websites set up to find these matches, like TwinStrangers.net, have already attracted over a million people from around the world.
Until recently it was thought that the likelihood of finding two strangers with identical faces was a real outside chance. But social media has smashed those odds, so what would have been like finding a needle in a haystack is now not only possible but also providing incredible matches.
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