The science of intelligence: g-factor research, fluid vs crystallized intelligence, Flynn effect, and psychometric methodology explained.
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.
Intelligence doesn't protect against cognitive biases — research shows some get worse with higher IQ. See 13 biases with their measured decision costs.
Research-backed signs of giftedness in children and when IQ testing makes sense. Assessment options, costs, and program placement.
How IQ scores distribute across the US population. Where you rank, what each standard deviation means, and career implications.
IQ predicts income only up to ~$70K, then plateaus. The top 1% of earners score lower than those just below. See the data.
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.
G-factor predicts income and job performance better than any other measure. Discover what this means for your career and how to use it strategically.
Does grit or IQ matter more for entrepreneurs? Research shows perseverance outperforms raw intelligence in startup outcomes.