David R. Hamilton explains how smiling is contagious

I love to as this Doc says" infect" people by smiling. I've experimented a little bit with this. I find that eye contact with the person is very key. The thing that I hate the most is when you are really smiling brightly at someone and they look down or away. Sometimes this happens on the trail. People can be so wrapped up in themselves that they don't have time for a quick "hi" or whatever. I used to just say hi to everyone. Now, it's usually if I get eye contact first. I wait to see if they hi first. It's a good thing I have some time on my hands, right? Hey, I can be a sociologist if i want to!