Articles
Long-form on IQ,
measurement, and what to take seriously.
Plain-language essays on cognitive psychometrics — what online tests can and can't tell you, what to train, and how to read a result with the right amount of scepticism.
- May 15, 2026· 5 min read
The fastest cognitive skill to train
If you have ten minutes a day for two weeks, the highest-leverage cognitive subdomain to drill is mental rotation. Here's why and how.
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- May 12, 2026· 5 min read
Why your IQ went down on the second attempt
Regression to the mean, item-bank exhaustion, fatigue, and the surprisingly normal reasons a re-test scores lower.
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- May 10, 2026· 6 min read
How accurate are online IQ tests, really?
What you can and can't conclude from a 30-minute browser test, compared to a clinical instrument like the WAIS-IV.
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