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 ...

The trick here is that your eyes get used to the pattern right away. Once the brain sees row after row of the same figure, it stops searching for anything unusual. That is why the odd number blends in ...

Optical illusion: Where is the hidden number? If the number 10 escaped your attention this time, here’s the solution. Move your eyes to the sixth row from the top and scan across to the sixth column ...

Our eyes naturally skim patterns. When every cell shows the same three digits, the mind quickly assumes uniformity and stops checking closely. Psychologists say this is tied to “visual search fatigue, ...

In this optical illusion challenge, number 2 is hiding in the number grid. Can you spot it in 8 seconds? Test your observation skills now! Optical Illusion Challenge: Optical illusions are ...

A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...