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The moment it all becomes clear...

[quote]Rutgers anthropologist Robin Fox has estimated that the majority of all marriages throughout history were between first and second cousins.[/quote]

Suddenly, what's wrong with people today, and the current state of the world becomes so much easier to understand...
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SW-User
Its probability - Higher in family tree if the marriages are being done in family for couple of generations. Otherwise, it can be healthy. Contrary, two people of different races can marry and have disable child.