Brainteasers are a great way to test your cognitive, problem-solving skills and intelligence. Some are designed to improve memory, while others can even test your IQ scores. It's even a great way to ...

Optical Illusion Challenge: Optical illusions are mind-bending images that challenge your perception and test your observation skills. There are three types of optical illusions: literal, ...

The trick lies in repetition. Once the brain sees the same number appear dozens of times, it stops paying close attention. Psychologists often call this “visual fatigue.” Your eyes are scanning, but ...

At first glance, the observer has a grid of the number 727. It seems like 727 occupies every nook and cranny of the grid in this viral optical illusion. The number 721is somewhere camouflaged in this ...