don't forget that LEAD was a common additive in all gasoline for decades, and in children causes...you guessed it, IQ drop.

"In children, it has been concluded that a 10 microgram per deciliter increase of lead in blood causes approximately a 2.5-point decrease in the IQ."

https://www.worstpolluted.org/projects_reports/display/66#:~:text=The%20use%20of%20leaded%20gasoline%20to%20achieve%20higher%20octane%20ratings.&text=Lead%20poisoning%20causes%20central%20nervous,impairs%20neurological%20development%20in%20children.

Lead gasoline wasn't fully phased out in the US until 1996 so that leaves a large swath of the living population having been affected by it :(

Also - seeing how easily duped most of the US population is by msm etc, I'm thinking of taking up three card monte