Authoritative guides on IQ testing, scoring methodology, careers, and our product.
A dated audit of what free IQ tests cost, from a one-dollar trial that renews at $29.99 every 28 days to competitors that charge nothing at all.
Across 737 U.S. occupations, AI exposure rises with reasoning demand (r = 0.71). Only nine high-reasoning jobs sit below median exposure, all hands-on.
IQ barely moves your own income, yet across 739 occupations a job's reasoning demand tracks close to half of what it pays. The honest, data-tested answer.
The reproducible dataset behind our reasoning-and-wage figure: O*NET 29.1 reasoning demand versus BLS 2024 median wages across 739 occupations, with full method and open download.
US adult numeracy fell 6 points on the 2023 PIAAC survey. See how that modeled decline maps to roughly $1,300 to $2,100 a year in per-worker wage exposure.
A gifted IQ score of 130 feels like a verdict, yet the reliability math expects more than 1 in 4 one-shot labels to regress below the line on a retest.
Cognitive ability still predicts job performance, but the corrected correlation fell from r = .51 in 1998 to r = .22 in 2024. See what shrank and what held up.
There is no single peak age. See how 10 professions map onto the abilities that peak at 19, 25, or the late 60s, and why experience offsets raw-speed decline.
Dermatology tops the specialty score ranking, but the gap is just 0.87 of one exam SD and no validated USMLE-to-IQ conversion exists. The data, decoded.
Only 5 occupations clear both the high-cognitive-demand bar and the $140k+ BLS mean-wage bar. A four-source synthesis of what IQ 130 buys you in 2026.
Why working memory caps expert performance, what the deliberate-practice meta-analyses show, and what to train when more reps stop working. The science.
We audited 7 popular IQ-to-career tools against published validity evidence. Only 1 of 7 disclosed a coefficient. Here is what the field's research says.