Finding hidden images in optical illusions is an effective mental exercise that challenges your cognitive functions while ...

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

Our eyes can frequently play tricks on us, but scientists have discovered that some artificial intelligence can fall for the same illusions. And it is changing what we know about our brains. When we ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images ...