I disagree about prozac as a cause. My hypothesis is that the elimination of leaded gas resulted in a new generation growing up without the brain damage caused

I disagree about prozac as a cause. My hypothesis is that the elimination of leaded gas resulted in a new generation growing up without the brain damage caused by chronic lead poisoning. Elevated lead levels have been well documented as causing reduced IQ and raised anti-social behaviors. >Lead pollution is dispersed into the air and into the vicinity of roads. Lead is a toxic metal that accumulates and has subtle and insidious neurotoxic effects especially at low exposure levels, such as low IQ and antisocial behavior. It has particularly deleterious effects on children. These concerns eventually led to the ban on TEL in automobile gasoline in many countries. For the entire U.S. population, during and after the TEL phaseout, the mean blood lead level dropped from 13 μg/dL in 1976 to only 3 μg/dL in 1991. http://en.wikipedia.org/wiki/Tetra-ethyl_lead http://en.wikipedia.org/wiki/Tetra-ethyl_lead