i remember he has a discussion of this in the better angels of our nature, because i remember when stephen levitt published fr economics. Andb he takes it like four pages of alysis of why this is not correct. But then the bottom line is, nothing big like crime or religion is going to have a single causal factor. The only partial exception i can think to that is it does seem that once they took the lead out of gasolene, kids got smarter.

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