Interesting article. I believe it’s true and happiness is a good feeling. Whats the benefit of being sad anyway lol. I notice this in class when the teacher is happy everyone in class seems to pick up on it and class goes by fast. Or when your girlfriend is happy it provides for some good times.
I am pretty sure that is why we keep the ditsy secretary around at work, because she makes everyone smile, dancing around the office, doing foolish stuff.