From TEDTalks: We’re all embedded in vast social networks of friends, family, co-workers and more. Nicholas Christakis tracks how a wide variety of traits — from happiness to obesity — can spread from person to person, showing how your location in the network might impact your life in ways you don’t even know.
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For a sample of related Situationist posts, see “The Social Situation of Breaking Up,” “Social Networks,” “Common Cause: Combating the Epidemics of Obesity and Evil,” and “Situational Obesity, or, Friends Don’t Let Friends Eat and Veg.”