Authoritative guides on IQ testing, scoring methodology, careers, and our product.
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.
Decade-by-decade IQ data from Hartshorne, Salthouse, Schaie, and Singh-Manoux shows no single peak age. See which abilities decline, hold, or rise after 45.
Cognitive intelligence predicts job performance better than any other trait. Learn the science behind g-factor, fluid vs. crystallized IQ, and career impact in 2026.
Your fluid intelligence peaked years ago. That's actually good news. Learn how to use the Gf-Gc framework for strategic career development at any age.
Polymaths earn $150K-$400K+ freelancing by stacking skills. Build a high-income portfolio career leveraging generalist intelligence.
Is an MBA worth it if you earn $150K+? True ROI analysis: opportunity cost, salary premiums, and payback periods by school tier.
Five behavioral patterns explain why intelligent people underperform financially. Research-backed strategies help analytical minds close the wealth gap.
The brain training industry sells hope. Research tells a different story. Here's what actually works to improve IQ, and what's pure marketing.