He was once the most lionized athlete on the planet, with seven straight Tour de France wins and a victory over cancer too. Then the doping charges caught up with him. When he finally confessed to Oprah, he admits, “it didn’t go well at all.” That’s because he wasn’t actually contrite yet. Now, five years later, he says he is. Do you believe him?

You wouldn’t think you could win a Nobel Prize for showing that humans tend to make irrational decisions. But that’s what Richard Thaler has done. The founder of behavioral economics describes his unlikely route to success; his reputation for being lazy; and his efforts to fix the world — one nudge at a time.