It's rare, but every once in a while, a decent fanfic rises from the endless sea of bad fanfiction to surprise and delight. This is one of those fanfics. In Harry Potter and the Methods of Rationality, Harry is raised by an Oxford professor as a Bayesian rationalist. All those moments in which you yelled "Harry, WHY? What are you doing, you stupid **?" are no more! Check out all 81 chapters in the via below.