I love this story of sleuthing out a database that already existed to explore the risk of getting fat if your friends get fat - social contagiousness.
NYTimes: Is Happiness Catching?
Nicholas Christakis and James Fowler say your friends — and even your friends' friends — can make you quit smoking, eat too much or get happy. A look inside the emerging science of social contagio
http://www.nytimes.com/2009/09/13/magazine/13contagion-t.html
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