Random Acts of Kindness Week (February 10-16)
Mark your datebooks. Last year, one random act of kindness at a cash register made this New York Times writer, "irrationally happy." But the extreme-challenge winner sent 11,000 handwritten letters to lonely folk all over the world (with some help from volunteers). Why not share the gift of unreasonably good vibes—and get some in return? After all, it's February. We all need it.