How Happiness Is Contagious

The theory that everyone on the planet is only a half dozen people away from knowing everyone else was popularized by John Guare's 1993 movie Six Degrees of Separation. Now research by a pair of social scientists might have Hollywood thinking of a sequel: Three Degrees of Connection.

Using statistical analyses of thousands of subjects, a study in The British Medical Journal has shown that happiness actually spreads from person to person, up to three connections away. "So if your friend's friend's friend becomes happier, it ripples through the network and affects you, even if you don't know that person," says author Nicholas Christakis, MD, a medical sociology professor at Harvard Medical School.

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