I'm not making assumptions off of a single case and I wasn't alone in retaining intelligence--among the white/N Euro kids. I had several kid friends who grew into their inborn intelligence, though two of the four committed suicide (white boys) in their teens because of violence at the hands of the feral blacks egged on by black teachers. 

I'm saying that if lead killed intelligence, I should have been drooling on my Barney doll. Or whatever we had at the time. Beany and Cecil. If lead automatically makes you stupid, then it would have been impossible for my IQ to test higher and higher while living next door to that lead delivery vector...and also next door to refineries and industry spewing even more. 

Lead itself doesn't make people stupid. 

Blacks are stupid because they are stupid. And that is genetic. We can demonstrate this at the group level, and you should know by now that the poorest raggedy ass white kids outscore the richest well off snooty black kids on every measure including school performance/IQ.