This week on our encore Summer Series, we look at the subtle art of "nudging." Schools, marketers and even governments are now using small nudges to gently steer people toward making more positive decisions in their lives. Those nudges included sending people a handwritten note when they are behind on their taxes because a handwritten note gets their attention, or putting the image of a housefly in urinals so men had something to aim at, thereby eliminating overspray by 80%. Or the simple act of getting high school kids to fill out a college application before they graduated was the nudge that changed the course of their lives. Nudges are small, almost invisible, and often controversial. It's a fascinating new aspect of influence.