Can money buy happiness? Studies show it can — up to a certain point. Social psychologist Elizabeth Dunn gives five tips for getting the biggest boost for your buck.

March 20 is International Happiness Day — a day that the United Nations had dedicated to the celebration of joy. We asked photographers around the world to share a picture that can bring bliss.

You might think happiness is self-explanatory–you know it when you feel it–but an experience I had many years ago when I was teaching English as a foreign language showed me defining happiness ...