Harry Potter and the Methods of Rationality

Harry Potter and the Methods of Rationality is a Harry Potter rational fanfic by Eliezer Yudkowsky, AI researcher and decision theorist. The book is also available in audiobook version here.

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.

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The Methods of Rationality
2: HJPEV and the Professor's Games
3: HJPEV and the Shadows of Death
4: HJG and the Phoenix's Call
5: HJPEV and the Last Enemy
6: HJPEV and the Philosopher's Stone