> Was it better medicine and food that stopped both your height and your brain from being stunted?
The ban on leaded petrol probably also helped.
> Was it better medicine and food that stopped both your height and your brain from being stunted?
The ban on leaded petrol probably also helped.
The timeline doesn't match.
The Flynn Effect covers from around 1930s to 1980s and the phase out of leaded gasoline happened during the very end of that timeline, meaning adolescent IQ measurements during the time the Flynn Effect covers would have all been raised in an environment where leaded fuel was either dominant or at least common.