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I fear we understand genetics only relatively better than we understand phrenology...



In fact a little worse, right now: we can predict about 20% of the variance in IQ from brain shape [1] but only 10% from genes [2].

[1] https://authors.library.caltech.edu/87270/

[2] https://www.nature.com/articles/s41588-018-0147-3




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