We know this to be true: It's a given that life is not about rainbows and sunshine all of the time. There will be days that it is going to be hard to hold your head high and put a smile on your face. However, happiness is a choice; and sometimes, you just occasionally need a boost to remind yourself of that fact. It is intuitive that people who smile and cut out negativity from their life will live longer, healthier lives. You hear it in TED talks,...