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Happiness Can Spread Among People Like a Contagion, Study Indicates

Washington Post
Dec. 5, 2008

By Rob Stein

Happiness is contagious, spreading among friends, neighbors, siblings and spouses like the flu, according to a large study that for the first time shows how emotion can ripple through clusters of people who may not even know each other. Stanley Wasserman, who studies social networks at Indiana University, said of the study: "We've known that one's network ties are important, but we've never looked at anything on this scale. The implications are you can't look at individuals as little entities devoid of their social context."

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