So, for example, I was giving this talk recently in New York City, and I said, "" You know when you're on the subway and the other person across the subway car smiles at you, and you just instinctively smile back? "" And they looked at me and said, "" We don't do that in New York City. "" (Laughter) And I said, "" Everywhere else in the world, that's normal human behavior. "" And so there's a very instinctive way in which we briefly transmit emotions to each other.