How Often Do We Smile?

For me, a smile means much more than a facial expression! Let's see the power of a smile:
If that's not enough let's see the next facts found by British researches.
By smiling you just don't improve your life but also the lives of others.
When you smile you look and feel good → You make other people smile → They feel and look good as well
A simple smile can have a big change, so why not smile more?