Average IQ varies depending on geographic location, resource access, and much more.

New research complicates the old consensus that IQ is largely fixed, and that's good news for anyone looking to boost their ...

The world’s shortest IQ test, the Cognitive Reflection Test (CRT), uses three questions to tell if you’re smart enough to go toe-to-toe with bona fide geniuses. It seems easy at first, but it requires ...

Psychologists administer IQ tests. Some psychologists don't test children younger than 4. Costs for testing can vary by the provider. Isla McNabb, a 2-year-old from Kentucky recently became the ...