Mummies from Peru and Egypt show around 1000 times less lead than 20 the century folks. Lead levels in bones have been linked to rates of criminality. Russians born around 2004 and afterwards were amongst the first to get about after leaded fuels were banned in Russia.
Japan was first to ban leaded fuels around 1986. Leaded fuels cause learning disabilities and criminal behavior.
Documentary:
https://youtu.be/IV3dnLzthDA
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