ktmrfs is right. Lead is more serious of a problem in the young because their cells are reproducing faster because they are maturing and therefore the effects of lead poisoning is more pronounced. Sure, these kids aren't dead but their IQ level has dropped amongst other potential problems. The argument that one has been consuming lead all their lives with no ill effects reminds of the cigarette smoking arguments that their uncles and fathers, mothers and so on have been smoking all their lives and they're still alive even though dad is impotent and mom has serious wrinkles.