The smiling face can be spotted on the left side of the picture. It’s a guy with a green t-shirt. That was tough to spot. If you loved this optical illusion challenge, remember to try out some ...

If you've ever poured a bowl of oatmeal or munched on a granola bar, you've likely been greeted by the smiling face of the ...

The face we present to the world is constantly ... in the orbicularis oculi – muscles that wrap around the eyes. All smiling involves contraction of the zygomatic major muscles, which lifts ...