gonzoalez
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https://gizmodo.com/the-science-of-marrying-your-cousin-1522745684
for the most part marriage among cousins has been popular as long as people have been getting married. In fact, it is estimated that as many as 80% of the marriages in human history have been between first or second cousins.
This switch in cousin-marriage's acceptance began in earnest in some parts of the Western world in the mid-19th century. Specifically, until the 1860s or so, first cousins commonly married in Europe and the U.S. In fact, Charles Darwin, Mr. Natural Selection himself, was married to his first cousin Emma Wedgwood.
Some reconcile the two findings by noting that the children born with defects in the recent British study may, in fact, have been double cousins (best explained by an example):
A community nurse who works among the Pakistani community in the British study opined:If a girl and her sister . . . meet two brothers, they pair off . . and each couple produces a baby . . . those kids [would be double cousins]
A first cousin marries a first cousin and the couple's own grandparents are cousins, too. I have heard of first-cousin marriages going back generation after generation in some families.