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[–] Shekelstein6M 0 points 18 points (+18|-0) ago  (edited ago)

http://time.com/3851843/twins-complications/

https://en.wikipedia.org/wiki/Superfecundation

In one study on humans, the frequency was 2.4% among dizygotic twins whose parents had been involved in paternity suits.

In 1982, twins who were born with two different skin colors were discovered to be conceived as a result of heteropaternal superfecundation.