"Mielke, along with colleague Sammy Zahran, compared leaded gasoline emissions with aggravated assault rates in Chicago and five other cities and found a good fit in each one.
"Both trends look like an upside-down 'U.' Emissions from leaded gasoline started increasing in the 1950s, peaked in the early '70s and then steadily declined. Aggravated assault rates rose, peaked and fell on a similar curve, only about 20 years later."
In the Chicago Tribune, Michael Hawthorne reports on the social effects of lead poisoning.
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