This is a feature episode of a new Slate podcast, How To! With Charles Duhigg. What if Dear Abby was an investigative reporter? Each week, Pulitzer Prize-winning journalist Charles Duhigg ("The Power of Habit") takes on listeners’ toughest problems and, with the help of experts, finds the answers to questions you’ve always wanted to ask, but couldn’t. Until now.Subscribe to How To! With Charles Duhigg on your preferred podcast app, or find it at slate.com/howto.Learn more about your ad choices. Visit megaphone.fm/adchoices