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Nicholas Christakis directs the Human Nature Lab at Yale University and is the Co-Director of the Yale Institute for Network Science. He is the Sol Goldman Family Professor of Social and Natural Science, appointed in the Departments of Sociology; Medicine; Ecology and Evolutionary Biology; and Biomedical Engineering at Yale University. His current research focuses on biology and health effect and is affected by social interactions and social networks. Other recent work has used experiments to examine the spread of altruism in social networks and the genetic and evolutionary determinants of social network structure.