Harry Potter and the Methods of Rationality is an on-going Harry Potter fanfic by Eliezer Yudkowsky, AI researcher and decision theorist. This is an Alternate Universe story, where Petunia married a scientist. Now rationalist!Harry enters the wizarding world armed with Enlightenment ideals and the experimental spirit. It should also be noted that the author is aware of us and has links to this page on his author's notes for chapter 20. And that the piece of fanfiction is the single most reviewed one in the Potterverse on the entire internet. And welcome to those of you from the fanfic's website!