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NYTimes article claims that Clean Air Act prevents crime
Darkfrog submitted, created time 1 year 2 months (www.nytimes.com)
We have yet another explanation for the drop in the American crime rate in the mid-1990's: This article cites a study proposing that lead causes brain damage of a sort that makes children less intelligent and more impulsive, that this makes the resulting teenagers more likely to commit crimes, and that the main source of this lead during the twentieth century was not paint but leaded gasoline.
The declining crime rate, she says, matches the declining average lead content in American blood, but with a twenty-year lag 
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