Drawing on cutting-edge research, award-winning journalist Jonathan Rauch answers all these questions. He shows that from our 20s into our 40s, happiness follows a well-documented U-shaped trajectory, a "happiness curve", declining from the optimism of youth into what's often a long, low trough in middle age, before starting to rise again in our 50s. This isn't a midlife crisis, though. Rauch reveals that this downturn is instead a natural stage of life - and an essential one. By shifting priorities away from competition and toward compassion, you can equip yourself with new tools of...