New, brief theoretical piece out in World Psychiatry: The Causal Structure of Mental Illness and Why It Matters. Not about genetics, I pursue one of my longest standing concerns, about relations between classification and reduction. Link is to whole issue; my piece starts on Page 3.

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Blog post: Ancestry and Education Indirect, direct, confounded and quasi-causal. I write about a preprint by Wang et al, in which they look for associations with genetic ancestry in an admixed Mexican population. They found genetic effects for height and Type-II diabetes, but not for education.

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In 2018, Charles Murray challenged me to a bet: "We will understand IQ genetically—I think most of the picture will have been filled in by 2025—there will still be blanks—but we’ll know basically what’s going on." It's now 2025, and I claim a win. I write about it in The Atlantic.

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Unless you have a hypothesis about actual group based dynamics, which is possible but very difficult, then any effect on a group is just an additive combination of effects on individuals.

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Does the example of the island with a high incidence of Down's Syndrome help? If you are smarter than be because you carry variant X and I don't, then groups of people with higher frequency of X will be smarter than people who are !X. X either causes smart or it doesn't. (assuming no GxE).

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