I like this theory MI, I really hope it has the snowball effect I think it has :o)
imagine going to work, and almost everyone of your coworkers are happy, would that influence your own mood, so you got a little happier aswell? I think and hope so :o)

we just need to focus on what is good and positive and not let all the negativity bring us down, im not saying we should ignore all thats wrong with the world, it's healthy to be aware of it, and try to change it, but you should not let it get to you, which is hard