As nasty as lead is, a few things make me wonder if some of the claims, particularly regarding low levels of lead and IQ, are on shaky ground. The Flynn Effect

As nasty as lead is, a few things make me wonder if some of the claims, particularly regarding low levels of lead and IQ, are on shaky ground. The Flynn Effect continued despite lead levels rising during the twentieth century. Now that lead has been eliminated, there should be clear increases in IQ- have these been found?