What if you could change your life without really changing your life? On the outside, Gretchen had it all -- a good marriage, healthy children and a successful career -- but she knew something was missing. Determined to end that nagging feeling, Gretchen set out on a year-long quest, her own “happiness project,” to learn how to better enjoy the life she already had. Each month, Gretchen pursued a different set of resolutions: go to sleep earlier, tackle a nagging task, bring people together, take time to be silly, along with dozens of other goals. She read everything from classical...