Why smile?

I remember reading a story a long time ago about the impact a smile can have on another person. The story spoke about positive attitudes and energy and how we can create that in our lives. They went on to say that providing a genuine smile, and I mean a heart warming smile, can promote the flow of positive energy from one person to the next and act as a catalyst to spread this energy from one person to the next.

Let's say one person is having a bad day. You are at work or on the street and give this person a cheerful, heartfelt smile. The sad person smiles back in response, maybe wondering what in the world you are up to or maybe catches your positive energy and smiles back to someone else on the street. You following me here? This may in turn create a flow of positive energy she takes to work and transfers throughout her workplace. In chemistry they have a word for reactions that create energy without losing energy. This is the tipping point. The point I want to make about smiles and why I do it every chance I can. :)