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.
Nicholas Christakis explores how the large-scale, face-to-face social networks in which we are embedded affect our lives, and what we can do to take advantage of this fact
If your friends are obese, your risk of obesity is 45 percent higher...If your friend’s friends are obese, your risk of obesity is 25 percent higher...If your friend’s friend’s friend, someone you probably don’t even know, is obese, your risk of obesity is 10 percent higher. It’s only when you get to your friend’s friend’s friend’s friends that there’s no longer a relationship between that person’s body size and your own body size.