An optical illusion featuring a camouflaged squirrel in an autumn scene is challenging internet users. Only 21% of people can ...

This new optical illusion is testing everyone’s observation skills; only a few people can find everything in 15 seconds.

For centuries, we’ve tried to understand what makes us aware. Is consciousness just the brain firing signals – or something ...

The photo shows dozens of translucent round beads glowing under a white ring light, each one catching rainbow reflections.

Have you ever looked at two circles of exactly the same size and sworn one was larger? If so, your eyes have been tricked by ...