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How are you supposed to measure this IQ?

I could be wrong, but I don't believe traditional IQ tests give a significant correlation to life-span once you control for environment. (though I think it's clear that wealthy people live longer and drink more)

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You measure with an IQ test. They work very well.

The longevity-IQ correlation is robust.

Can you point me to a source for this?

I thought the problem discovered with IQ tests is that they don't work very well at all?

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