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By Ryan T. Howell, Ph.D.
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By Todd B. Kashdan, Ph.D.
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By Allison Aboud Holzer
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By Gretta Krane
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By Andrew Rosenthal
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By Sonja Lyubomirsky
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By Simine Vazire, Ph.D.
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By Barbara L. Fredrickson, Ph.D.
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By Christopher Peterson
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By Stephen G. Post
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By Michael F. Steger, Ph.D.
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By T. Byram Karasu, M.D.