An optical illusion challenge is testing people’s observational skills! In a sea of 7s and 3s, a lone number 8 is hidden—can you spot it? This brain teaser plays on perceptual grouping, making it ...

Psychologists categorize intelligence into different forms, including fluid intelligence, which is the ability to solve new ...

If you're looking for some true or false quiz questions for your next night in, you've come to the right place. We put together a list of the best brain-tickling questions, and split them up into ...