Cousin-screwing. It is not totally safe. It raises the risk of birth defects slightly. But I was reading in a book for history that there’s, like, a 99.9999 percent chance that at least one of your great-great-great-grandparents married first cousin.

Cousin-screwing. It is not totally safe. It raises the risk of birth defects slightly. But I was reading in a book for history that there’s, like, a 99.9999 percent chance that at least one of your great-great-great-grandparents married first cousin.

– John Green –

Let It Snow: Three Holiday Romances

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