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Douglas_Knight comments on Open Thread, May 4 - May 10, 2015 - Less Wrong
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Yes, separated twins are rare. But twins and adoption by themselves are common and can be studied separately. Either one alone can separate nature from nurture. And they both show the same result: 50% genetics, 0% parenting.
In what way? As knb mentioned above, parenting has a direct effect on e.g. what language you learn. On the other hand, parenting has zero effect on, for example, the color of your eyes. So you have to first specify what variables you're looking at.
I hope you realize that this is an extremely strong claim.