I learnt this eventually, in the course of
general reading, from a book, «Influence», aimed at a
popular audience, by a distinguished
psychology professor, Robert Cialdini... I immediately sent copies of Cialdini's book to all my children.
Positive
psychology caught the attention of the
general public in 2006 when Professor Tal Ben - Shahar's positive
psychology class became Harvard's most
popular course, with an enrollment of 855 students.