An examination of emotions reported on 12 million personal blogs along with a series of surveys and laboratory experiments shows that the meaning of happiness is not fixed; instead, it systematically shifts over the course of one’s lifetime.Whereas younger people are more likely to associate...

Why do people give to others? One principal driver involves one's identity: who one is and how they view themselves. The degree to which identities are malleable, involve a readiness to act, and help make sense of the world have significant implications determining whether and how much people...