Decades after writing “The Tipping Point,” Malcolm Gladwell says he's less optimistic. He tells NPR's Steve Inskeep he reexamined his book about social epidemics, and rewrote it with darker themes.

Malcolm Gladwell's latest book is Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering, and he is the host of the podcast Revisionist History. Motley Fool host ...