Learn Something Every DaySuperfecundation
It's when someone gets pregnant with fraternal twins and they are by two different men. I feel really silly, because I did not know this was possible until today. My daughter has gotten me into this tv show called American horror. Anyhow, some chick in the show is pregnant with twins and they have two different fathers, so I had to look it up. According to a study, in 1 in 40 paternity tests fraternal twins actually turn out to be half brothers or sisters because of having two different fathers.