Average IQ in Africa by Country: 53-Country Ranking
Compare average IQ estimates across 53 African countries, with source years, methodology caveats, and direct links to every country profile.
IQ Science
IQ Science
The science of intelligence: g-factor research, fluid vs crystallized intelligence, Flynn effect, and psychometric methodology explained.
Average IQ in Asia by Country: 47-Country Ranking
Compare average IQ estimates across 47 Asian countries, including source years, regional context, and direct links to every country profile.
Average IQ in Europe by Country: 45-Country Ranking
Compare average IQ estimates across 45 European countries, with source years, methodology notes, and links to every country profile.
Average IQ in North America by Country: 23-Country Ranking
Compare average IQ estimates across 23 North American, Central American and Caribbean countries, with sources and profile links.
Average IQ in Oceania by Country: 14-Country Ranking
Compare average IQ estimates across 14 Oceanian countries, with source years, data limitations, and links to every country profile.
Average IQ in South America by Country: 12-Country Ranking
Compare average IQ estimates across 12 South American countries, with source years, regional context, and links to every profile.
Is a Gifted IQ Score Reliable? The Math Says 1 in 4 Won't Repeat
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.
Does IQ Predict Job Performance? A Shrinking Number
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.