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Do you have a double?

Mysteries of Science

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The Mystery of Doppelgangers

There are two plausible explanations for why we get doppelgangers. One is that humans have been selected to have individually distinctive faces. The other is that there's only so much genetic diversity within human populations. Dr Nancy Seegaltwins: I think there's quite a bit left to be discovered and I would estimate that we're at about a 50% point.

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