Why do most highly educated people miss how reciprocity works? Because intelligence and emotional intelligence are not the same thing, and human behavior runs on the second one. I'll line up a flower legend, a grocery sample, a Facebook like, an earthquake relief story between two nations, and a mint on a restaurant check, and ask what they have in common. Most brilliant people, Harvard, Yale, Duke, whatever the diploma says, cannot see it. The thread is reciprocity, the pull to repay an exchange, and it's invisible to people who were never trained to read human behavior. Dental school is the [...]