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"In the normal population, g and IQ are roughly 90% correlated and are often used interchangeably."

Sorry the science doesn't agree with what you think it should be, I will be sure to let the scientists know.

I literally have no idea what your point with that quote is.

Anyway, Wikipedia has a good overview of the main gripes with IQ: https://en.wikipedia.org/wiki/Intelligence_quotient#Criticis...

Looks like grandparent could use a copy of Vigen's _Spurious Correlations_:

I think it'd make a lovely coffee table book.