Not just happiness. I hate when people say happiness, when they mean many other things. Happiness isn't everything; this experiment is still true for those who realize that seeking only happiness is shallow. Help others, and you gain much deeper things.
TheBERRY: A boy went to war in 1914 and left his bike chained to a tree. He never came home and the family left the bike there as a memorial to the fallen soldier. Vashon Island, in Puget Sound, Washington State.