What IQ is, how IQ tests work, the history and science of intelligence measurement.
28 articles
“Bias” covers at least six different psychometric questions, and the research answers them differently. Measurement invariance, differential item functioning and predictive bias explained — without a blanket verdict.
Dog IQ" mostly means one 1994 obedience survey — not a real IQ test. Here's what it measured, what modern research adds, and how to test your own dog.
"155" is everywhere online — but no test, examiner, or date backs it. Here's what's actually documented, and why estimates range from 100 to 160.
Almost any site can put your name on a PDF and call it "official." Here's what actually separates a real certificate from a printable one.
BuzzFeed runs several different "IQ test" quizzes — and one openly admits results are "entirely inaccurate." Here's what they actually measure.
Reddit's cognitive-testing community built its own free IQ test with a published validity report. Here's what CORE actually measures, and its limits.
The MoCA screens for mild cognitive impairment, not IQ — and it's sensitive enough that 4 in 10 people without dementia can score below "normal."
A 50-question, 12-minute test used by 30,000+ employers and, for decades, the NFL. Here's what it actually correlates with, and why it isn't quite an IQ test.
On general intelligence, the average difference between sexes is negligible. The real, replicated finding is about variability — not average IQ.
