was really a coming of age of the last lead baby's...
NYC removed most of the lead in apartments by 1977 and so the kids born after that were not as affected by lead in their environment...
The less lead, the less volatile behavior...
Here is something from a post I put up in September....
"Although crime did fall dramatically in New York during Giuliano's tenure, a broad range of scientific research has emerged in recent years to show that the mayor deserves only a fraction of the credit that he claims. The most compelling information has come from an economist in Fairfax who has argued in a series of little-noticed papers that the "New York miracle" was caused by local and federal efforts decades earlier to reduce lead poisoning.
The theory offered by the economist, Rick Nevin, is that lead poisoning accounts for much of the variation in violent crime in the United States. It offers a unifying new petrochemical theory for fluctuations in the crime rate, and it is based on studies linking children's exposure to lead with violent behavior later in their lives.
What makes Nevin's work persuasive is that he has shown an identical, decades-long association between lead poisoning and crime rates in nine countries."
http://www.washingtonpost.com/wp-dyn/conte...