POSTED 19 FEBRUARY 2009
Credits
Leaf Van Boven
Associate professor of psychology and neuroscience, University of Colorado
Edward Diener
professor of psychology, University of Illinois.
Elizabeth Dunn
Assistant professor of psychology, University of British Columbia.
Ryan Howell
assistant professor of psychology at San Francisco State University.
Mohammad Siahpush
Professor of health promotion, University of Nebraska Medical Center in Omaha.
Terry Devitt, editor; Nathan Hebert, project assistant; S.V. Medaris, designer/illustrator; David Tenenbaum, feature writer; Amy Toburen, content development executive