With rich and complete stories, the book comprehensively displays the most popular Harvard open course: positive psychology from the easy to the difficult and complicated in plain and easy-to-understand language, aiming to guide the readers to experience life in a better way and increase the sense of happiness for a more valuable life.With rich and complete stories, the book comprehensively displays the most popular Harvard open course: positive psychology from the easy to the difficult and complicated in plain and easy-to-understand language, aiming to guide the readers to experience life in a better way and increase the sense of happiness for a more valuable life.