In the 21st century, the social sciences offer a promise for improving human welfare. The advances that we have made and will be making, especially in understanding human behavior and its very deep origins, will be translated into interventions of diverse sorts that will have a much bigger impact in terms of improving human welfare , said Nicholas Christakis in a recent conversation in EDGE (see video). Christakis is a Physician and Social Scientist at Harvard University and Coauthor (with James Fowler) of “Connected: The Surprising Power of Our Social Networks and HowThey Shape Our Lives”. The book suggests that your colleague's husband's sister can make you fat, even if you don't know her. A happy neighbor has more impact on your happiness than a happy spouse. These startling revelations of how much we truly influence one another are revealed in the studies of Drs. Christakis. CONNECTED overturns the notion of the individual and provides a revolutionary paradigm-that social networks influence our ideas, emotions, health, relationships, behavior, politics, and much more. A health care policy specialist Christakis (Death Foretold: Prophecy and Prognosis in Medical Care) became interested in social connectivity when observing that the mortality rate of spouses spike after a partner passes away. Christakis sought out a collaboration with Fowler, a health systems and political scientist, and together they compare topology (the hows of a given structure) across different social networks to better explain how participation and positioning enhances the effectiveness of an individual, and why the "whole" of a network is "greater than the sum of its parts." Five basic rules describe the relationship between individuals and their networks-including mutual adaptation, the influence of friends and friends' friends, the network's "life of its own"-but the results do more than promote the good of the group: they also spread contagions; create "epidemics" of obesity, smoking and substance abuse; disseminate fads and markets; alter voting patterns; and more.