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A set of essays by Eliezer Yudkowsky that serve as a long-form introduction to formative ideas behind Less Wrong, the Machine Intelligence Research Institute, the Center for Applied Rationality, and substantial parts of the effective altruism community. A set of essays by Eliezer Yudkowsky that serve as a long-form introduction to formative ideas behind Less Wrong, the Machine Intelligence Research Institute, the Center for Applied Rationality, and substantial parts of the effective altruism community. The Codex contains essays about science, medicine, philosophy, politics, and futurism. (There’s also one post about hallucinatory cactus-people, but it’s not representative) What if Harry was a scientist? What would you do if the universe had magic in it? A story that illustrates many rationality concepts. 