A recent social media optical illusion is revealing inner emotional states. Seeing two girls first suggests a playful, social ...

Optical illusions are the tricksters of the puzzle world; they are designed in such a way that they fool our brains and eyes.

Add Yahoo as a preferred source to see more of our stories on Google. Drivers over 70 will have to take an eye test every three years to keep their licence [Getty Images] Drivers over the age of 70 ...