He’s not denying that how we are raised by our parents affects who we are, or that the kind of schools we went to, the friends we have, or the neighborhoods we live in affect our behavior. All of these things are undoubtedly important. Nor is he denying that our genes play a role in determining who we are. Most psychologists believe that nature—genetics—accounts for about half of the reason why we tend to act the way we do. His point is simply that there are certain times and places and conditions when much of that can be swept away, that there are instances where you can take normal people
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