17. Be a Work Altruist

If a junior associate asks for help with her report, what should you say? "Sure." Because—conscious of it or not—offering to lend a hand to others at work actually makes us happier, found a study at the University of Wisconsin-Madison (as long as you're not giving so much time away that you can't complete your own work).

18. Take a Note from Aretha

R-E-S-P-E-C-T may just be your key to living a happy life. In a study at the University of California, Berkeley, researchers found that overall happiness is rooted in how much respect and admiration you have from the your closest friends, co-workers and family.

19. Pack These Foods into Your Diet

One of these edible antidepressants might be all you need to go from hungry and cranky to full and content.

20. Rock Out to Vintage Madonna Records

Note, we said records—not albums, not tracks, not MP3s. In one study at Harvard University, people who were placed in an environment that resembled their youth—with movies, music and memorabilia from the past—experienced marked improvements in their memory, vision, happiness level and overall health.

21. Appreciate a Fuller In-Box

Isn't more work a formula for more stress? Nope—to the contrary, found a Harvard Business School leadership study. More responsibilities meant lower stress-hormone levels—and less anxiety and burnout. Crucially, the additional work must give you a morale boost, not drown you in drudgery.


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