The controversial Harvard economist, recently back from a suspension, “broke a lot of glass early in my career,” he says. His research on school incentives and police brutality won him acclaim — but also enemies. Now he’s taking a hard look at corporate diversity programs. The common thread in his work? “I refuse to not tell the truth.”

Breaking news! Sources say American journalism exploits our negativity bias to maximize profits, and social media algorithms add fuel to the fire. Stephen Dubner investigates.