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Reduced exposure to lead probably has something to do with it.

http://www.motherjones.com/kevin-drum/2014/08/childhood-lead...

"This means that lead exposure is likely to be associated not just with violent crime, but with juvenile misbehavior, drug use, teen pregnancy, and other risky behaviors."

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Wow... that would have to be almost as good correlation as vaccines cause autism. I have a feeling it is more likely due to easier access to knowledge.

Except it's well known that lead exposure during childhood can cause irreversible brain damage.

Probably a correlation of lead exposure to anti-vaccines views then. I noticed it's mostly a slightly older generation to my own that are anti-vaccine.

People even older than that remember what its like to not have them.

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