A short-form IQ test, CRT, from 2005 has found new popularity on TikTok. Developed by an MIT professor, the quick IQ test is ...

This is a straightforward vocabulary test, so if you've ever taken the SATs, this will feel totally familiar. Take the quiz here. It's highly unlikely you'll ever need to write something without spell ...

What is an Optical Illusion? An optical illusion is a visual phenomenon where the brain misinterprets what the eyes see.

Taiwan and Hong Kong also recorded very high scores, around 107. However, they were not included in the final country ...

This 1937 version of the Stanford-Binet Intelligence Scales was produced in the United States. It used objects because this IQ test was aimed at children. Credit: SSPL/ Getty Images The Hechinger ...

US President Donald Trump has claimed that he has taken an "IQ test," appearing to confuse it with a dementia screening test. Boasting of a perfect score, he also challenged his Democratic rivals, ...