Children whose mothers are exposed to high amounts of certain pesticides such as organophosphates, (commonly sprayed on food crops and can be found in trace amounts on berries) while pregnant appear to have lower IQs than their peers when they reach school age. The pesticides have also been used in homes and gardens, although their indoor use has been widely restricted due to safety concerns. These trends have been found outside of rural communities, as many as 25% of pregnant women in the general population have levels above the study average.
http://www.cnn.com/2011/HEALTH/04/21/womb.pesticide/index.html
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