The extremely young science of the microbiome is going from microbiome/disease 'associations' to establishing causation. Weird how this hasn't occurred for IQ in the past 100 years...https://twitter.com/EricTopol/status/938475406507720704 …
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Because of how they're made. You can make tests that show other groups as smarter based on item selection. This is a fact.
(Answer: yes, of course they do) Note that I use the term IQ test loosely to include other high quality tests like the SAT, which is mostly a test of intelligence.
And those tests correlate with other tests because, again, due to how they're constructed. I showed something showing how IQ heritability 'increases' due to how it's built into the test.
IQ tests aren't construct valid. Is IQ like height? Weight? Blood pressure? RMR? Stroke volume? Which physiological trait does it mimic? Surely you know physiological traits are also not stable too...
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