Nicholas Kristof: The four secrets of success
(Photo by Joe Russo | Invision | AP) Bastille performs on stage at the New Year's Eve celebration in Times Square on Monday, Dec. 31, 2018, in New York.
(Photo by Joe Russo | Invision | AP) Bastille performs on stage at the New Year's Eve celebration in Times Square on Monday, Dec. 31, 2018, in New York.