Astral Codex Ten Podcast

• Everything-Except-Book Review Contest 2025

  I enjoy the yearly book review contest, but it feels like last year’s contest is barely done, and I want to give you a break so you can read more books before we start over. So this year, let’s do something different. Submit an ACX-length post reviewing something, anything, except a book. You can review a movie, song, or video game. You can review a product, restaurant, or tourist attraction. But don’t let the usual categories limit you. Review comic books or blog posts. Review political parties - no, whole societies! Review animals or trees! Review an oddly-shaped pebble, or a passing cloud! Review abstract concepts! Mathematical proofs! Review love, death, or God Himself! (please don’t review human races, I don’t need any more NYT articles) Otherwise, the usual rules apply. There’s no official word count requirement, but previous finalists and winners were often between 2,000 and 10,000 words. There’s no official recommended style, but check the style of last year’s finalists and winners or my ACX book reviews (1, 2, 3) if you need inspiration. Please limit yourself to one entry per person or team. Then send me your review through this Google Form. The form will ask for your name, email, the thing you’re reviewing, and a link to a Google Doc. The Google Doc should have your review exactly as you want me to post it if you’re a finalist. DON’T INCLUDE YOUR NAME OR ANY HINT ABOUT YOUR IDENTITY IN THE GOOGLE DOC ITSELF, ONLY IN THE FORM. I want to make this contest as blinded as possible, so I’m going to hide that column in the form immediately and try to judge your docs on their merit. https://www.astralcodexten.com/p/everything-except-book-review-contest 

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• Why Should Intelligence Be Related To Neuron Count?

  Intelligence seems to correlate with total number of neurons in the brain. Different animals’ intelligence levels track the number of neurons in their cerebral cortices (cerebellum etc don’t count). Neuron number predicts animal intelligence better than most other variables like brain size, brain size divided by body size, “encephalization quotient”, etc. This is most obvious in certain bird species that have tiny brains full of tiny neurons and are very smart (eg crows, parrots). Humans with bigger brains have on average higher IQ. AFAIK nobody has done the obvious next step and seen whether people with higher IQ have more neurons. This could be because the neuron-counting process involves dissolving the brain into a “soup”, and maybe this is too mad-science-y for the fun-hating spoilsports who run IRBs. But common sense suggests bigger brains increase IQ because they have more neurons in humans too. Finally, AIs with more neurons (sometimes described as the related quantity “more parameters”) seem common-sensically smarter and perform better on benchmarks. This is part of what people mean by “scaling”, ie the reason GoogBookZon is spending $500 billion building a data center the size of the moon. All of this suggests that intelligence heavily depends on number of neurons, and most scientists think something like this is true. But how can this be? https://www.astralcodexten.com/p/why-should-intelligence-be-related

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• Links For February 2025

  [I haven’t independently verified each link. On average, commenters will end up spotting evidence that around two or three of the links in each links post are wrong or misleading. I correct these as I see them, and will highlight important corrections later, but I can’t guarantee I will have caught them all by the time you read this.] https://www.astralcodexten.com/p/links-for-february-2025

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• Why I Am Not A Conflict Theorist

  Conflict theory is the belief that political disagreements come from material conflict. So for example, if rich people support capitalism, and poor people support socialism, this isn’t because one side doesn’t understand economics. It’s because rich people correctly believe capitalism is good for the rich, and poor people correctly believe socialism is good for the poor. Or if white people are racist, it’s not because they have some kind of mistaken stereotypes that need to be corrected - it’s because they correctly believe racism is good for white people. Some people comment on my more political posts claiming that they’re useless. You can’t (they say) produce change by teaching people Economics 101 or the equivalent. Conflict theorists understand that nobody ever disagreed about Economics 101. Instead you should try to organize and galvanize your side, so they can win the conflict. I think simple versions of conflict theory are clearly wrong. This doesn’t mean that simple versions of mistake theory (the idea that people disagree because of reasoning errors, like not understanding Economics 101) are automatically right. But it gives some leeway for thinking harder about how reasoning errors and other kinds of error interact. https://readscottalexander.com/posts/acx-why-i-am-not-a-conflict-theorist 

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• Highlights From The Comments On Tegmark's Mathematical Universe

  [Original thread here: Tegmark’s Mathematical Universe Defeats Most Arguments For God’s Existence.] 1: Comments On Specific Technical Points 2: Comments From Bentham’s Bulldog’s Response 3: Comments On Philosophical Points, And Getting In Fights https://www.astralcodexten.com/p/highlights-from-the-comments-on-tegmarks

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