Erika Christakis and Nicholas A. Christakis

Erika Christakis, M.P.H, M.Ed., is an early childhood educator at the Yale Child Study Center.  Follow her on Twitter @ErikaChristakis.

Nicholas A. Christakis, M.D., Ph.D., is the co-director of the Institute of Network Science at Yale University. Nicholas was named to the TIME 100 in 2009. Follow him on Twitter @NAChristakis.

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