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https://today.duke.edu/2022/03/lead-exposure-last-century-shrunk-iq-scores-half-americans
Leaded gasoline calculation to have stolen over 800 million cumulative IQ points since 1940s
A new study calculates that exposure to car exhaust from leaded gas during childhood stole a collective 824 million IQ points from more than 170 million Americans alive today, about half the population of the United States.
I’m of the opinion that we defined it several thousand years ago, in some form at least.
https://howtobeastoic.wordpress.com/2016/01/19/one-crucial-word/