Dr. Nicholas Christakis is a sociologist and physician known for his research on social networks and on the socioeconomic, biosocial, and evolutionary determinants of behavior, health, and longevity. Follow Dr. Christakis on Twitter @NAChristakis or go to www.humannaturelab.net to learn more.
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Purple Mattress: Get a free pillow by texting DREW to 474747
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See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
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