On: Leaded fuel reduced IQ of children born before 199...

[paulpauper]

then doesn't this counter the argument that IQs are falling

[Tenoke → paulpauper]

It does. They are not. Or at least if some factors are lowering it, other factors like better nutrition and deleading etc. are more than counteracting it.

[steerablesafe → paulpauper]

https://en.wikipedia.org/wiki/Simpson%27s_paradox