# Rationality: From AI to Zombies

[![](https://intelligence.org/wp-content/uploads/2015/03/Rationality-Angled-Cover-Web.jpg)](https://intelligence.org/rationality-ai-zombies/)

Eliezer Yudkowsky's original Sequences have been edited, reordered, and converted into an ebook!

_Rationality: From AI to Zombies_ is now available in PDF, EPUB, and MOBI versions on intelligence.org (**[link](https://intelligence.org/rationality-ai-zombies/)**). You can choose your own price to pay for it (minimum $0.00), or buy it for $4.99 from Amazon (**[link](http://smile.amazon.com/Rationality-AI-Zombies-Eliezer-Yudkowsky-ebook/dp/B00ULP6EW2/ref=sr_1_9?ie=UTF8&qid=1426182905&sr=8-9)**). The contents are:

*   333 essays from Eliezer's 2006-2009 writings on _Overcoming Bias_ and _Less Wrong_, including 58 posts that were not originally included in a [named sequence](http://wiki.lesswrong.com/wiki/Sequences).
*   5 supplemental essays from yudkowsky.net, written between 2003 and 2008.
*   6 new introductions by me, spaced throughout the book, plus a short preface by Eliezer.

The ebook's release has been timed to coincide with the end of Eliezer's other well-known introduction to rationality, _[Harry Potter and the Methods of Rationality](http://hpmor.com)_. The two share many similar themes, and although _Rationality: From AI to Zombies_ is (mostly) nonfiction, it is decidedly unconventional nonfiction, freely drifting in style from cryptic allegory to personal vignette to impassioned manifesto.

The 333 posts have been reorganized into twenty-six sequences, lettered A through Z. In order, these are titled:

*   A — Predictably Wrong
*   B — Fake Beliefs
*   C — Noticing Confusion
*   D — Mysterious Answers
*   E — Overly Convenient Excuses
*   F — Politics and Rationality
*   G — Against Rationalization
*   H — Against Doublethink
*   I — Seeing with Fresh Eyes
*   J — Death Spirals
*   K — Letting Go
*   L — The Simple Math of Evolution
*   M — **Fragile Purposes**
*   N — A Human's Guide to Words
*   O — **Lawful Truth**
*   P — Reductionism 101
*   Q — Joy in the Merely Real
*   R — Physicalism 201
*   S — Quantum Physics and Many Worlds
*   T — Science and Rationality
*   U — **Fake Preferences**
*   V — Value Theory
*   W — **Quantified Humanism**
*   X — Yudkowsky's Coming of Age
*   Y — Challenging the Difficult
*   Z — The Craft and the Community

Several sequences and posts have been renamed, so you'll need to consult the ebook's table of contents to spot all the correspondences. Four of these sequences (marked in **bold**) are almost completely new. They were written at the same time as Eliezer's other _Overcoming Bias_ posts, but were never ordered or grouped together. Some of the others (A, C, L, S, V, Y, Z) have been substantially expanded, shrunk, or rearranged, but are still based largely on old content from the Sequences.

One of the most common complaints about the old Sequences was that there was no canonical default order, especially for people who didn't want to read the entire blog archive chronologically. Despite being called "sequences," their structure looked more like a complicated, looping web than like a line. With _Rationality: From AI to Zombies_, it will still be possible to hop back and forth between different parts of the book, but this will no longer be _required_ for basic comprehension. The contents have been reviewed for consistency and in-context continuity, so that they can genuinely be read _in sequence_. You can simply read the book as a book.

I have also created a community-edited [Glossary for _Rationality: From AI to Zombies_](http://wiki.lesswrong.com/wiki/RAZ_Glossary). You're invited to improve on the definitions and explanations there, and add new ones if you think of any while reading. When we release print versions of the ebook (as a six-volume set), a future version of the Glossary will probably be included.