Just something to smile at ;)
Did you know there's only one smile that makes us happy?So, if you're smiling now, I hope that's the one!
Dr. Ekman, who developed a widely used system for reading people's emotions from small changes in facial muscles, has identified 18 kinds of smiles, each using slightly different combinations of muscles and signaling different messages. He said that the one smile that activates the brain centers for enjoyment is the same grin that spontaneously crinkles the eyes into crow's feet during a chuckle.
Source: One Smile (Only One) Can Lift A Mood (by Daniel Goleman)