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>> reporter: often, even more than you expect. >> i would like to teach first grade and be a swim coach. >> reporter: but these new studies show how some pesticides could some day bring those dreams down to earth. the studies by columbia, berkeley and mt. sinai measured certain pesticides in pregnant mothers. the first to study their effects in utero and then seven years later, tested their children's iqs. they found that above average exposure was linked to a drop in their children's iqs by as much as seven points. >> one of my concerns is why we're not in a position to identify these kind of has saturday hazards earlier. >> reporter: these pesticides are found in a whole range of simple, every day products. fruits and vegetables. in pesticides used to control cockroaches in city apartments. and in home weed killers. they've also been detected in