Rick Nevin: Photograph by Scott Robinson for Washingtonian article by John Pekkanen [PDF]
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Why is the Murder Rate Lower in New York City?
USA Murder Rate at Historic Record Low
Lead Paint and the Baseline Crime Rate
 Lead & Crime: 
    Why this Correlation does mean Causation
 The Plummeting USA Incarceration Rate

The Answer is Lead Poisoning
     The Questions are ...

Lead Poisoning and The Bell Curve 
"The great danger in this emotional atmosphere is that there will develop a two-tiered set of reactions--violent public outcries against the message of The Bell Curve by some, and uncritical private acceptance of it by many others, who hear no rational arguments being used against it." - Thomas Sowell