Critical thinking may not be a heritable trait, but the IQ required to do it is.
It has become well-known recently that at IQ 90 and downward people start having real trouble handling counterfactual conditionals. “How would you feel if you hadn’t eaten breakfast this morning?” is the probe of this capability that has gone viral.
How are you going to do critical thinking if you can’t process counterfactual conditionals? It would be like trying to dance when you can’t walk. But this is a problem that extends above the normal IQ 85 threshold for mental subnormality. We’re looking at 20% to 25% of the U.S. population here.
Eric S. Raymond, Twitter, 2024-05-19.
September 11, 2025
QotD: Heritable IQ and the ability to think critically
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