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https://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-caused-americas-violent-crime-epidemic/
lead in gasoline caused lead poisoning, leading to an increase in violent crime. now most fuel is unleaded, reducing the incidence of lead poisoning, and leading directly to a decrease in violent crime
Condoms given out by Planned Parenthood in the 70s reduced crime in 90s.
And Roe v. Wade increased access to abortion about the same time, together with the leaded gas.
Yep. What's more, this effect is even seen in countries that had less lead poisoning to begin with, like Sweden. Average blood lead levels in Sweden were below the level that the US government even considered concerning at the time — but they still got a ~5% decrease in crime by phasing out leaded gasoline.
Lead makes people stupid & impulsive; and stupid & impulsive people do more crime.
https://www.su.se/polopoly_fs/1.207429.1413788630!/menu/standard/file/WP14no9.pdf
So the FAA needs to hurry their hinds in phasing out leaded avgas, which is still used today in piston engine aircraft (small planes)