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The Fatima Sun Miracle: Much More Than You Wanted To Know

Astral Codex Ten Podcast

Release Date: 10/23/2025

The Good News Is That One Side Has Definitively Won The Missing Heritability Debate show art The Good News Is That One Side Has Definitively Won The Missing Heritability Debate

Astral Codex Ten Podcast

…the bad news is that they can’t agree which one. I explained the debate more , but the short version is: twin studies find that most traits are at least 50% genetic, sometimes much more. But molecular studies - that is, attempts to find the precise genes responsible - usually only found enough genes for the traits to be ~10-20% genetic. The remaining 35% was dubbed “missing heritability”. Nurturists argued that the twin studies must be wrong; hereditarians argued that missing effect must be in hard-to-find genes. The latter seemed plausible because typical genetic studies only...

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Astral Codex Ten Podcast

If we worry too much about AI safety, will this make us “lose the race with China”? (here “AI safety” means long-term concerns about alignment and hostile superintelligence, as opposed to “AI ethics” concerns like bias or intellectual property.) Everything has tradeoffs, regulation vs. progress is a common dichotomy, and the more important you think AI will be, the more important it is that the free world get it first. If you believe in superintelligence, the technological singularity, etc, then you think AI is maximally important, and this issue ought to be high on your mind. But...

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Astral Codex Ten Podcast

Most discourse on AI is low-quality. Most discourse on consciousness is super-abysmal-double-low quality. Multiply these - or maybe raise one to the exponent of the other, or something - and you get the quality of discourse on AI consciousness. It’s not great. Out-of-the-box AIs mimic human text, and humans always describe themselves as conscious. So if you ask an AI whether it is conscious, it will often say yes. But because companies know this will happen, and don’t want to give their customers existential crises, they hard-code in a command for the AIs to answer that they aren’t...

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Astral Codex Ten Podcast

ACX has been co-running a forecasting contest with Metaculus for the past few years. Lately the “co-running” has drifted towards them doing all the work and giving me credit, but that’s how I like it! included more than 4500 forecasters predicting on 33 questions covering US politics, international events, AI, and more. They’re preparing for this year’s contest, and currently looking for interesting questions. These could be any objective outcome that might or might not happen in 2026, whose answer will be known by the end of the year. Not “Will Congress do a good job?”, but...

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Astral Codex Ten Podcast

Last year, I wrote that it would be . Commenters argued that no, it would be easy, just build more jails and mental hospitals. A year later, San Francisco feels safer. Visible homelessness is way down. But there wasn’t enough time to build many more jails or mental hospitals. So what happened? Were we all wrong? Probably not. I only did a cursory investigation, and this is all low-confidence, but it looks like: There was a big decrease in tent encampments, because a series of court cases made it easier for cities to clear them. Most of the former campers are still homeless. They just...

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In What Sense Is Life Suffering? show art In What Sense Is Life Suffering?

Astral Codex Ten Podcast

“Life is suffering” may be a Noble Truth, but it feels like a . Yes, obviously life includes suffering. But it also includes happiness. Many people live good and happy lives, and even people with hard lives experience some pleasant moments. This is the starting point of many people’s objection to Buddhism. They continue: if nirvana is just a peaceful state beyond joy or suffering, it sounds like a letdown. An endless gray mist of bare okayness, like death or Britain. If your life was previously good, it’s a step down. Even if your life sucked, maybe you would still prefer the heroism...

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Astral Codex Ten Podcast

In Jason Pargin’s , a manic pixie dream girl cajoles a shut-in incel loser to drive her and her mysterious box cross-country. The further they drive, the more evidence starts to build that she is a terrorist and her box is a nuke. As our protagonist becomes increasingly desperate to turn around and return to his comfortable world of social media feeds and psych meds, she pleads with him to come out of his shell, learn to trust people offline, and have a sense of adventure. The book’s dramatic tension comes from our simultaneously rooting for his character development and worrying that it...

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Astral Codex Ten Podcast

American Scholar has , including and . It’s good that this is getting more attention, because in theory it seems like one of the most influential things a writer could do. In practice, it leaves me feeling mostly muddled and occasionally creeped out. “Writing for AI” means different things to different people, but seems to center around: Helping AIs learn what you know. Presenting arguments for your beliefs, in the hopes that AIs come to believe them. Helping the AIs model you in enough detail to recreate / simulate you later. Going through these in order:

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Links For October 2025 show art Links For October 2025

Astral Codex Ten Podcast

[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.]

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Model City Monday 10/27/25 show art Model City Monday 10/27/25

Astral Codex Ten Podcast

Would You Like To Buy A Bahama? The Bahamas is an archipelago-nation of 400,000 people scattered across 3,000 small islands. The Bahamas’ most populous island is the one with its capital, Nassau. The second-most-populous - and fifth-largest, and most-pretentiously-named - is Grand Bahama, home of Freeport, the archipelago’s second city. Grand Bahama has a unique history. In 1955, it was barely inhabited, with only 500 people scattered across a few villages. The British colonial government turned it into a charter city, awarding the charter to , an American whose Wikipedia article describes...

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https://www.astralcodexten.com/p/the-fatima-sun-miracle-much-more

0: Here Comes The Sun

In 1917, three Portuguese children reported a vision of the Virgin Mary. She promised to return to them on the 13th of each month. On the sixth month - October 13th - she would perform a great miracle.

Rumors spread, and on the 13th of each month, crowds gathered to watch the children speak to an apparition that only they could see. Increasingly many of these pilgrims started reporting minor visions or miracles themselves. Anticipation for the great October miracle consumed the region, then the country.

On October 13, a crowd of about 70,000 people descended on the children’s home village of Fatima. At solar noon, the children made contact with the Virgin and said the great miracle was still on track. Then someone - accounts differ as to whether it was the children or a member of the crowd - pointed to the sky.

According to the ~150 eyewitness accounts that have come down to us, the clouds parted, and the pilgrims saw a strange pale sun (or sun-like object), painless to gaze upon. As they watched in wonder, it began to spin around and flash all the colors of the rainbow, drenching the trees and buildings and crowd with yellow, green, and purple light in sequence. Then it seemed to loom, or grow, or fall to earth - accounts differ, but everyone agrees there was mass panic, as the people expected to be crushed or burned or consumed. It lurched downward three times, as the crowd screamed in terror or confessed their sins - then returned to its usual place in the sky. The whole affair had lasted ten minutes.

Since then, the Sun Miracle of Fatima has gained a reputation as the final boss of paranormal experiences, the ultimate challenge for would-be skeptics and debunkers. It’s not hard to see why. The witnesses included journalists, atheists, prominent scientists, and people who freely admitted that they had only attended in order to laugh at everyone else when nothing happened. There are far too many of them to dismiss, and their reports are surprisingly close to unanimous. People in nearby towns who knew nothing about the miracle claimed to have seen the same thing, seemingly ruling out mass hallucination. There are photographs - too low-tech to clearly visualize the sun, but clear enough to show a crowd pointing at the sky in astonishment. For one hundred eight years, believers and skeptics have written magazine articles, scientific papers, and at least a dozen books on the topic, mostly without progress.

Now its fame has reached Substack. Ethan Muse presents the case in favor, and Evan Harkness-Murphy the case against, with additional commentary from Dylan and Bentham’s Bulldog. I don’t think any of them have risen to the occasion. Ethan observes the formalities of good debate, but regurgitates such a neatly-packaged story that readers are liable to miss the thousand little threads that trail off the bottom and lead places that are, if anything, even stranger than the original miracle. Evan puts admirable effort into arguing that child-seers could confabulate visions, but by the time he gets to the sun miracle itself, he has only a few potshots about crowd psychology and “optical phenomena”. Other skeptics are even worse, barely gesturing at Evan’s piece before redirecting their attention to boasts about how they have totally demolished the credulous fundies, or laments about how cosmically unfair it is that they must take time out of their busy schedules to respond to such idiocy. The final boss of the paranormal deserves more respect!

We will at try to at least do better than the other Substackers. But as a stretch goal, I would like to actually advance this 108-year-long conversation.