Back in the day paint used to have lead as an ingredient, people would use this to paint the inside of tunnels, over passes and buildings and other such things. As the years passed this lead paint peeled away into small chips that could, if one had the predilection, be eaten thus incurring lead poisoning.
Ingesting lead affects the brain especially the ability to process information efficiently thus making one stupider if they consumed enough lead.
Considering the pedantic nature of your comment I assumed that you may have ingested some of these chips and your thought process has slowed down.
Nothing you said has any relation to the claim that lead paint resulted in IQ scores being lower because as I said before. That is literally impossible when the mean of a test result is equal to 100
Did you think you wouldn’t be called out on a lie or were you just ignorant of the claim you were making?
Maybe you were ignorant of time and thought that a 100 year old test would somehow have a ton of historical data from people not exposed to led
Or you were ignorant of age and test bias thinking it fair to compare a 70 year old high school graduate with someone in college
I was using IQ as a comparative device because most people know what that is and thus would be able to understand what I meant.
On average, according to some online sources most people will have an IQ somewhere between 85 and 115 that's a difference of 30 points, or as I called it tens of points.
If humanity would have used less lead it is possible that average could have been substantially higher by tens of points which is a perfectly valid statement considering the 30 point difference in the average.