The Case for Banning Cousin Marriage. Do you want to raise your group's IQ? Ban cousin marriage. There's five points in a generation right there. At the lower end, it can be the difference between living independently versus always having to have supports (including informal). And as group/national IQ is likely more important to your quality of life than your individual score, you should get your tribal elders convinced of this post haste.
Dunno if it's true, but I read years ago that one of the reasons Jews have been so successful is that they are one of the first groups to ban first-cousin marriage.
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