On NPR this morning: a news item that makes me smile. New research shows that happiness can spread through social networks. "We find that people at the center of the social network tend to be happier," says co-author James Fowler, a political science professor at U.C. San Diego. He continues, "These are people with more friends and friends of friends." Now, they didn't use me for this study, but there's no doubt that I'm happy and it's due in large part to all of my friends.