An optical illusion has been making the rounds on social media claiming to be a stress test, but the artist says the whole thing is fake. Featured Video It all started when the image was posted on ...

Your brain is lying to you right now. Not maliciously, and not because something’s wrong with it. It’s doing exactly what evolution designed it to do, making split-second decisions about the world ...

Add Yahoo as a preferred source to see more of our stories on Google. Researchers are finding that many of them do experience these perceptual quirks, though not always in the same way. "Illusions ...

IQ tests are a great way to assess a person's intelligence. These tasks assess a person's cognitive abilities, including memory, pattern identification, logical reasoning, and analytical thinking.