Could you be happier at work . . . in love . . . in life? You may not need a total overhaul--just a few good Happiness Hacks Here are hundreds of shortcuts to brighten your day and boost your mood--and the science behind how they work. Discover why . . . 57 F (13.9 C) is the happiest temperature Selfies give you a jolt of joy Renters have a surprising edge over homeowners 17-minute breaks are the most productive Intimacy is better than sex It's...