Harry Potter and the Methods of Rationality

Harry Potter and the Methods of Rationality (HPMOR) is a work of Harry Potter fan fiction by Eliezer Yudkowsky published on FanFiction.Net as a serial from February 28, 2010 to March 14, 2015, totaling 122 chapters and over 660,000 words. It adapts the story of Harry Potter to explain complex concepts in cognitive science, philosophy, and the scientific method.