See! ... It wasn't the post WWII Public "Schools" after all, AND, that's the reason the Boomer Marxist Liberals are stupid, not Liberalism.
We've been wrong all this time.
“Lead from gasoline blunted the IQ of about half the U.S. population, study says”
Most of which would logically be in big cities where the pollution is concentrated. Lead pipes and lead paint may also have contributed.
I bet the methodology of the study is flawed. Too many other variables have been overlooked.