I bet you are already smiling:)
A simple smile has 2 secrets.....
First it works out your facial muscles! Well is that a secret?? No not this one... The fact is, if you only consider using these muscles to put a smile on your face, this little change in your physiology will induce a shift in your state and maybe even releasing happy hormones.
It is actually amazing how states are linked to physiology. The change in these facial muscles work like a push button to the state of being in a smily mood. Test it.... I know you can feel it yourself. Most people do.
The second secret is what Your Smile can do to Others. Neuroscientists have discovered what is called "Mirror Neurons". These neurons fire when we notice an act or a behavior that we are familiar with, and this stimulates the same act or behavior in us. So whenever you smile mirror neurons of others around you may notice this, and a smile is stimulated on their faces.
Have you ever been smiling as you were walking on the street, then noticed strangers smiling back at you??.... I did.
AND, Now I know why I smiled when I saw the picture of that Chimp!!