If you want to increase your chances of having a healthy baby, you might want to look at some of the branches of your own family tree. No, really.
It turns out that third and fourth cousins tend to have lots and lots of babies when they hook up. Procreating with anyone closer than a second cousin is still a bad idea, according to this research out of Iceland.
For those of us who wouldn't be able to pick a third cousin out of a line-up, the idea that having sex with one doesn't exactly feel like it would be incestuous. Still, it's good information to have, I guess. Maybe this tidbit of info has more impact in Iceland, where you have to find something to do indoors all winter.
photo: scientific american
