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Re:Steady Decline in Major Crime Baffles Experts by jobu on Tuesday May 24, 2011 @11:10AM (#2580111)
They've also mentioned the removal of lead from paint and gasoline:

http://www.freakonomics.com/2007/07/09/lead-and-crime/

Re:Steady Decline in Major Crime Baffles Experts by ajju on Tuesday May 24, 2011 @11:29AM (#2580196)
Makes you wonder what harmful things we are being unknowingly exposed to now, that in 20 years will be correlated with serious negative effects on individuals or societies.
Re:Steady Decline in Major Crime Baffles Experts by astrodust on Tuesday May 24, 2011 @01:40PM (#2580786)
Farmville type games and reality television.