What is an Optical Illusion? An optical illusion is a visual phenomenon where the brain misinterprets what the eyes see.

It all started one summer lunchtime in 1992 on the terrace outside the CERN cafeteria. If you had happened to be there at the physics research lab near Geneva at the time, you might have overheard ...

Have you ever noticed certain numbers appearing repeatedly in your life? Perhaps you glance at the clock, and it always seems to say 11:11, or you keep seeing the number 222 on license plates, ...