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I'll take lead contamination for $500 Alex.
As mentioned in the article, its the only correlation that matches with both the US and world-wide violent crime stats. Every single person on Earth (but especally in the Industrialized/Mechanized World) is exposed to gasoline and its combustion byproducts on a daily basis. Look into the whole lead gasoline additive issue (and how the petrolium industry tried to cover it up) and then google up lead poisoning. As soon as they switched over the MTBE the crime rate started to go down. Now look into the MTBE contamination issue and see how widespread THAT **** got and the problems they now have discovered with it.