Here's a brain teaser that's taking the internet by storm: can you find the hidden kite in this bustling café scene within ...

Your brain wants to interpret the dragon as a face, and faces are convex: The sides of the face curve away from you (when you look at someone’s face, their nose is closer to you than their ears).

Nine years ago, Luc Besson came across a theory that humans only use 10% of their brain capacity. A quick Google search would have informed the French filmmaker responsible for cult classics like ...