Pat Greenhouse/Globe Staff/file 2007
Nicholas A. Christakis (pictured) and James H. Fowler argue that our brains evolved so we could form social networks. (Pat Greenhouse/Globe Staff/File 2007)
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Our social networks and where we sit in them set the course for much of what happens in our lives, say Nicholas A. Christakis, a doctor and sociology professor at Harvard, and James H. Fowler, a political scientist at the University of California-San Diego. (Full article: 686 words)
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