Why do some people and companies struggle to change, despite years of trying, while others seem to remake themselves overnight? How do habits work, and where, exactly, do they reside in our brains? Pulitzer Prize-winning reporter Charles Duhigg, author of The Power of Habit, explores what Olympic swimmer Michael Phelps, Starbucks, and the civil rights movement can teach us about how habits can shape how we think, behave, and live.