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The world is not only hungry for happiness, but also for the science of happiness: university courses in positive psychology are depopulated in universities on the opposite sides of the Atlantic. Which have become a popular phenomenon – through free online courses – thanks to famous universities for making exclusivity a boast, such as those of the Ivy League. The course founded by the psychologist Laurie Santos at Yale, for example, today it has 3.8 million subscribers worldwide, is the most followed course in the 319-year history of the University, and the related podcast, Happiness Labhas 65 million downloads.