By Robert Waldinger, Marc Schulz
By Donna Hicks, PhD, Desmond Tutu
By Matt Haig
By Sigmund Freud
By Peter Hollins
By Daniel Nettle (Lecturer in Biological Psychology at the Open University)
By Paul Gilbert
By Capacchione, Lucia
By Donald Sturrock
By Brian Moses, Mike Gordon
By Kathlyn Hendricks, Gay Hendricks, PhD
By Jason Fox
By Jeffrey A. Gray
By Daniel Goleman
By Britt Wray
By Glenn A. Albrecht
By Stanley Milgram
By John T. Cacioppo, William Patrick
By Barbara Fredrickson
By Longman, Tremper Iiiallende
By Barrett, Lisa Feldman
By Sternberg PhD, Robert J., Karin
By Ellis Ph.D, Albert
By Krech, Gregg
By John Paul Pope, Paul, John II, John Paul II, Pope
By Jenkins, Jennifer M.
By Geetu Bharwaney
By Mo Gawdat
By Claude Steiner, Ph. D., Paul Perry