"In our always-on, productivity-addicted lifestyles, we tend to think of the pursuit of fun as being indulgent, even immature and childish. When we do find the time to relax or care for ourselves, we tend to turn to activities that are not actually restorative: binging Netflix, scrolling through Twitter, or indulging our FOMO on Instagram. Through years of research, journalist Catherine Price has learned the truth: far from being frivolous or a distraction,...