You are Surprisingly Likely to Have a Living Doppelganger

Article from BBC:

http://www.bbc.com/future/story/20160712-you-are-surprisingly-likely-to-have-a-living-doppelganger

tl;dr: If instead of defining a doppelganger as someone who has exactly the same detailed features you have you define it as someone whose "rough sum" of features is the same, doppelgangers are much more common, but they don't give any actual number, just examples.