1: Daniel Coyle spent four years visiting and researching eight of the world’s most successful groups, “including a special-ops military unit, an inner-city school, a professional basketball team, a movie studio, a comedy troupe, and a gang of jewel thieves,” he writes in The Culture Code: The Secrets of Highly Successful Groups.

“When you ask people inside highly successful groups to describe their relationship with one another, they all … continue reading