Writing
Honest writing about testing and thinking
No hype, no borrowed authority, no claims we cannot support. If the evidence is thin, we say so.
March 17, 2026 · 7 min read
Can you improve your cognitive performance? An honest answer
Brain-training claims outrun the evidence. What actually seems to move measured performance, what only moves your test score, and how to tell whether a change in your result is real.
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February 24, 2026 · 8 min read
Are free online IQ tests accurate?
Some are informative, most are theatre. A practical guide to telling the difference — the warning signs, the honest signals, and how accurate an unsupervised online test can realistically be.
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February 3, 2026 · 6 min read
How adaptive testing works, and why it needs fewer questions
Adaptive tests choose each question based on how you answered the last ones. Here is why that produces a tighter estimate in half the questions — and where the approach has real limits.
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January 14, 2026 · 7 min read
What IQ scores actually mean (and what they don't)
An IQ score is a position in a distribution, not a quantity of intelligence. Here is how the 100-average scale works, what a percentile really tells you, and the decisions a score should never be used for.
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