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Friendship as a Health Factor

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Science  23 Jan 2009:
Vol. 323, Issue 5913, pp. 454-457
DOI: 10.1126/science.323.5913.454

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Summary

In a string of hot articles, two social scientists report that obesity, smoking, and other behaviors "spread" in networks. As the two friends expand their theory, doubters sharpen their questions.

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