IQ effects of childhood lead exposure persist with age.

IQ effects of childhood lead exposure persist with age.
http://www.environmentalhealthnews.org/ehs/newscience/iq-effects-childhood-lead-exposure-persist-in-adults/

"New evidence suggests childhood lead exposure may have a persistent and irreversible effect on IQ during the adult years. A 30 year follow-up study in Boston found that even low level exposure to lead during childhood – that is, at or below the U.S. level of concern of 10 µg/dL – may impair adult cognitive function enough to lower IQ scores."