Harry Potter and the Methods of Rationality

Harry Potter and the Methods of Rationality is a fan fiction novel by Eliezer Yudkowsky, first published in 2015 and written in English. It reworks the Harry Potter setting rather than simply retelling it. The familiar magical world is used as a frame for ideas about science, the scientific method, philosophy, and rational thinking. The story follows Harry through his first year at Hogwarts, but with a different starting point: he enters the wizarding world already shaped by a strong education in science and an experimental mindset.

This is a good fit for readers who like fantasy with ideas at the center, not just plot and atmosphere. It may appeal especially to anyone interested in how a known fictional world changes when reason, testing, and logic are treated as part of the story itself. Its special quality is the way it combines fan fiction with cognitive science and rationalist thinking, so it sits naturally between adventure fantasy and intellectually driven speculative writing.