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Leaded gas and violence

Below is a link to an interesting article about a possible cause of the decline of violence in the US over the last few years.
As we all know, correlation does not prove causation. However... I found the article to be interesting and so have provided the link. Enjoy.

http://www.motherjones.com/environment/2013/01/lead-crime-link-gasoline

In addition, here is a link to Steven Novella's blog discussing the above article. His view and the comments are useful.

http://theness.com/neurologicablog/index.php/lead-and-crime/

Dan