Quidditch Quidditch World Cup on Pottermore, culminating in a short story about the final featuring the return of Harry, Ron, Hermione and their friends as adults. This generated interest from several media outlets, as it was the first new writing about the "Harry Potter" characters since the end of the series in 2007. Quidditch is introduced in "Harry Potter and the Philosopher's Stone", and is a regularly recurring feature throughout the first six books. It is depicted as being played by both professionals (as in tournaments like the Quidditch World Cup) and amateurs. A major motif of five of the "Harry
Harry Potter and the Methods of Rationality of "HPMOR" spontaneously burped itself into existence inside my mind, so it came out as a Harry Potter story. ... there's a large number of potential readers who would enter at least moderately familiar with the Harry Potter universe." He states that his work on rationality "informs every shade of how the characters think, both those who are allegedly rational and otherwise". He also used it to assist the launch of the Center for Applied Rationality, which teaches courses based on his work. Unlike J. K. Rowling's original books, in which the orphaned Harry Potter is raised by the abusive