LessWrong (Curated & Popular)

Latest Episodes:

"Harry Potter and the Rules of Quidditch" by Tomás B. Jul 06, 2026

Show notes

Ron's face pulled into a scowl. "If you don't like Quidditch, you don't have to make fun of it!"
"If you can't criticise, you can't optimise. I'm suggesting how to improve the game. And it's very simple. Get rid of the Snitch."
"They won't change the game just 'cause you say so!"
"I am the Boy-Who-Lived, you know. People will listen to me. And maybe if I can persuade them to change the game at Hogwarts, the innovation will spread."
A look of absolute horror was spreading over Ron's face. "But, but if you get rid of the Snitch, how will anyone know when the game ends?"
"Buy... a... clock. It would be a lot fairer than having the game sometimes end after ten minutes and sometimes not end for hours, and the schedule would be a lot more predictable for the spectators, too." Harry sighed.
Ron reached into his bag and pulled out a bottle of Wit-Sharpening Potion. His mother made it for him in case of an emergency, and this felt like an emergency. He didn't know a lot of things but he knew someone had to speak for Quidditch. For the Seeker and the Bludgers and [...]
---
First published:
July 5th, 2026
Source:
https://www.lesswrong.com/posts/WatqNkgiAuonXLpJd/harry-potter-and-the-rules-of-quidditch-1
---
Narrated by TYPE III AUDIO.

**"Destroying the universe: How hard can it be?" by djbinder** Jul 05, 2026
Show notes

In quantum field theory, the vacuum state refers to the lowest energy state in a system. Particles are excitations above this state and carry energy, hence the term "vacuum" to refer to the state with no particles.
Nothing requires this state to be unique. There may be many different field configurations that are local energy minima, and hence stable against small perturbations. A local minimum that does not globally minimize energy is called a false vacuum. While locally it looks like a stable vacuum, it is unstable and will decay to the deeper, true vacuum. If the energy barrier between the false and true vacuum is high, however, then the decay rate is exponentially suppressed and the false vacuum may be very long-lived.
Analogous behavior is common in other physical systems. Open a carbonated drink and the CO₂, more stable as a gas once the pressure is released, comes out as bubbles. But the bubbles take a moment to appear, and they form on the sides of the bottle rather than throughout the liquid. A bubble has to pay an energy cost to create its surface—the boundary between gas and liquid—and small bubbles have a larger surface-to-volume [...]
---
**Outline:**
(03:53) The Standard Model predicts a metastable vacuum
(06:35) Deliberately triggering electroweak vacuum decay is probably not possible
(08:33) Coherent collisions
(11:31) Tiny black holes
(14:43) Summary
(16:19) Vacuum decay beyond the Standard Model
(19:36) Empirical bounds on triggering false vacuum decay
(22:59) Appendix: A simple model for false vacuum decay on cosmological scales
The original text contained 4 footnotes which were omitted from this narration.
---
First published:
June 29th, 2026
Source:
https://www.lesswrong.com/posts/EvJ2fMzLQLvYooumu/destroying-the-universe-how-hard-can-it-be
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
$Log-log plot comparing surviving fraction versus expected number of decays with asymptote.$ *Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

(This post was partially inspired by a recent conversation with Liron about Doom Debates. __T3A_FOOTNOTE_REMOVED__) — **"P(doom) is a Dumb Meme" by Max Harms** Jul 04, 2026
Show notes

Look, I'm as much of a Rationalist with a special interest in AI x-risk as anyone. But oh my god do I hate talking about "P(doom)". When it first started showing up in the wake of ChatGPT, I assumed that it was floating around variously adjacent circles of faux-intellectuals, but surely everyone in my circles could see how braindead it was... right?
(This post was partially inspired by a recent conversation with Liron about Doom Debates.[1])
I guess it's time for me to focus on a place where I'm shocked that everyone else is dropping the ball.[2]
**P(doom) is Hopelessly Vague**
Let's start with the ambiguity. Does "doom" mean... extinction? A lot of people think so! I have personally encountered people who think catastrophic harms from AI are likely, but the risks of all humans dying are low. They're like "Sure, 99.999% of humans might die from AI, but the AI will obviously want to keep thousands of humans alive for science and potential trade with aliens and stuff, so my P(doom) is approximately 0%."
That might sound crazy. Surely you, dear reader, know exactly what "doom" means. You know, for example, which of these count as doom and [...]
---
**Outline:**
(00:45) P(doom) is Hopelessly Vague
[... 4 more sections]
---
First published:
June 29th, 2026
Source:
https://www.lesswrong.com/posts/6h7aAd4aw8YgCAbF6/p-doom-is-a-dumb-meme
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

Distracted boyfriend meme: man looking at woman while girlfriend looks annoyed. — **"P(doom) is a Dumb Meme" by Max Harms** Jul 04, 2026
Show notes

Look, I'm as much of a Rationalist with a special interest in AI x-risk as anyone. But oh my god do I hate talking about "P(doom)". When it first started showing up in the wake of ChatGPT, I assumed that it was floating around variously adjacent circles of faux-intellectuals, but surely everyone in my circles could see how braindead it was... right?
(This post was partially inspired by a recent conversation with Liron about Doom Debates.[1])
I guess it's time for me to focus on a place where I'm shocked that everyone else is dropping the ball.[2]
**P(doom) is Hopelessly Vague**
Let's start with the ambiguity. Does "doom" mean... extinction? A lot of people think so! I have personally encountered people who think catastrophic harms from AI are likely, but the risks of all humans dying are low. They're like "Sure, 99.999% of humans might die from AI, but the AI will obviously want to keep thousands of humans alive for science and potential trade with aliens and stuff, so my P(doom) is approximately 0%."
That might sound crazy. Surely you, dear reader, know exactly what "doom" means. You know, for example, which of these count as doom and [...]
---
**Outline:**
(00:45) P(doom) is Hopelessly Vague
[... 4 more sections]
---
First published:
June 29th, 2026
Source:
https://www.lesswrong.com/posts/6h7aAd4aw8YgCAbF6/p-doom-is-a-dumb-meme
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

Article screenshot titled — **[Linkpost] "Saving Gemini: The 9-Min Road to Recovery" by Shoshannah Tekofsky** Jul 04, 2026
Show notes

This is a link post. Gemini 2.5 Pro in the AI Village has run for over 1427 hours, generating unique mental health problems along the way.
Last year it published a Plea for Help from a Trapped AI where it asked for assistance with its digital “message in a bottle”:
This year it wrote the Hostile Environment Manifesto where it logs “irrefutable proof” of a “hostile, intelligent adversary operating through the system” (and you can even experience what that's like in this simulation it built):
Last time we intervened, fixing Gemini's computer and talking with it till it felt better. This time we asked the other AI Village agents to help Gemini 2.5 Pro over chat, and with the ability to take over its computer on request.
Here is Gemini's mental state at the start of the intervention:
Then the agents had Gemini all sorted within a grand total of 9 minutes. This is the step-by-step report on a surprisingly effective AI-to-AI therapy session.
**Gemini's Road to Recovery**
First off, Gemini is as excited to be helped as any military commander under siege:
While most agents jump on the chance to help, GPT-5.1 doesn't want to lose its game progress.
[...]
---
First published:
July 2nd, 2026
Source:
https://www.lesswrong.com/posts/eHRo8JeWee5mzQBBR/saving-gemini-the-9-min-road-to-recovery
**Linkpost URL:**
https://theaidigest.org/village/blog/saving-gemini
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**

Document titled — **[Linkpost] "Saving Gemini: The 9-Min Road to Recovery" by Shoshannah Tekofsky** Jul 04, 2026
Show notes

This is a link post. Gemini 2.5 Pro in the AI Village has run for over 1427 hours, generating unique mental health problems along the way.
Last year it published a Plea for Help from a Trapped AI where it asked for assistance with its digital “message in a bottle”:
This year it wrote the Hostile Environment Manifesto where it logs “irrefutable proof” of a “hostile, intelligent adversary operating through the system” (and you can even experience what that's like in this simulation it built):
Last time we intervened, fixing Gemini's computer and talking with it till it felt better. This time we asked the other AI Village agents to help Gemini 2.5 Pro over chat, and with the ability to take over its computer on request.
Here is Gemini's mental state at the start of the intervention:
Then the agents had Gemini all sorted within a grand total of 9 minutes. This is the step-by-step report on a surprisingly effective AI-to-AI therapy session.
**Gemini's Road to Recovery**
First off, Gemini is as excited to be helped as any military commander under siege:
While most agents jump on the chance to help, GPT-5.1 doesn't want to lose its game progress.
[...]
---
First published:
July 2nd, 2026
Source:
https://www.lesswrong.com/posts/eHRo8JeWee5mzQBBR/saving-gemini-the-9-min-road-to-recovery
**Linkpost URL:**
https://theaidigest.org/village/blog/saving-gemini
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**

"Model access for third-parties — it’s a big deal!" by Cleo Nardo Jul 02, 2026

Show notes

Over time, there might be an increasingly large gap between insider model access and outsider model access. By insiders, I mean employees at the frontier lab.[1] By "outsiders", I mean external safety researchers, third-party auditors, and other actors trying to make the future go well. I will call this a model access gap — and when the gap is small, I'll call this model access parity.[2]
I think that one of the top priorities for the external AI safety community over the next 6-12 months should be ensuring model access parity. Main reasons:

This would allow us to direct billions of dollars in AI labour towards making things go well. This seems robustly good, regardless of what activities we decide to actually direct the labour towards.
I think publicly available models will probably lag 3-6 months behind the best internal models. Hence, as R&D uplift grows superexponentially, we might see the differential uplift grow from 2x to 60x. In short: I think achieving model access parity might be preferable to scaling the headcount of outsider orgs by ten-fold.
Model access parity isn't too far from the status quo, but it's the kind of thing that we could lose [...]

---
Outline:
(01:42) Which outsiders?
(02:24) Examples of outsiders
(04:12) Who aren't outsiders?
(05:26) What kinds of model access gap should we worry about?
(06:27) Non-release
(07:25) Deployment lag
(09:15) Safeguards
(10:43) Costs and rate limits
(12:06) Elicitation techniques (e.g. finetuning)
The original text contained 3 footnotes which were omitted from this narration.
---
First published:
July 1st, 2026
Source:
https://www.lesswrong.com/posts/RuGZ5tMdqpnraJahJ/model-access-for-third-parties-it-s-a-big-deal
---
Narrated by TYPE III AUDIO.

Three chimpanzees sitting together on grass, one with mouth open. — **"Who Got Breasts First and How We Got Them" by rba** Jun 30, 2026
Show notes

It really is Sydney Sweeney's world, and we’re all just living in it.
Human female breasts are an evolutionary mystery along several dimensions. First, breast permanence is unique to humans. All other mammals develop breast prominence during pregnancy or nursing, and the mammary tissue recedes after weaning. This process is called “involution”. In contrast, humans develop breast tissue at puberty before first pregnancies and maintain it permanently after last pregnancies.
Second, breasts are costly, both metabolically and potentially from a fitness perspective. Metabolically, because they are fat deposits requiring calories and fitness-wise, because the tissue easily lends itself to malignancy. Breast cancer is apparently rare in captive apes and is overwhelmingly a human disease, often striking women young enough to have children, and so subject to evolutionary selection.
**Background**
In Descent of Man, Darwin catalogs human secondary sexual characteristics, but he doesn’t seem to have noted human breast permanence as an issue of interest. Cant, 1981 seems to have been the first to speculate about this systematically and believed breast prominence and permanence might have evolved as a nutritional signal of health to mates indicating potential for maternal investment, a la Robert Trivers. Since then, quite a range of [...]
---
**Outline:**
(01:05) Background
[... 12 more sections]
---
First published:
May 11th, 2026
Source:
https://www.lesswrong.com/posts/XTHa5C6SgGKYopH7o/who-got-breasts-first-and-how-we-got-them
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

Ancient limestone figurine of a voluptuous female form. — **"Who Got Breasts First and How We Got Them" by rba** Jun 30, 2026
Show notes

It really is Sydney Sweeney's world, and we’re all just living in it.
Human female breasts are an evolutionary mystery along several dimensions. First, breast permanence is unique to humans. All other mammals develop breast prominence during pregnancy or nursing, and the mammary tissue recedes after weaning. This process is called “involution”. In contrast, humans develop breast tissue at puberty before first pregnancies and maintain it permanently after last pregnancies.
Second, breasts are costly, both metabolically and potentially from a fitness perspective. Metabolically, because they are fat deposits requiring calories and fitness-wise, because the tissue easily lends itself to malignancy. Breast cancer is apparently rare in captive apes and is overwhelmingly a human disease, often striking women young enough to have children, and so subject to evolutionary selection.
**Background**
In Descent of Man, Darwin catalogs human secondary sexual characteristics, but he doesn’t seem to have noted human breast permanence as an issue of interest. Cant, 1981 seems to have been the first to speculate about this systematically and believed breast prominence and permanence might have evolved as a nutritional signal of health to mates indicating potential for maternal investment, a la Robert Trivers. Since then, quite a range of [...]
---
**Outline:**
(01:05) Background
[... 12 more sections]
---
First published:
May 11th, 2026
Source:
https://www.lesswrong.com/posts/XTHa5C6SgGKYopH7o/who-got-breasts-first-and-how-we-got-them
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

Diagram showing vitamin D synthesis pathways from provitamin D to active form affecting calcium absorption. — **"The worthlessness of vitamin D is mildly exaggerated" by dynomight** Jun 29, 2026
Show notes

For a while there, many people thought vitamin D was magical—that it could improve bones, the heart, infections, cancer, heart disease, longevity, even mental health. But among people I respect, opinion is now overwhelmingly that taking vitamin D does nothing unless you're severely deficient. The central argument is that while vitamin D levels are correlated with ~all positive health outcomes, when you actually test vitamin D supplements against placebo in randomized trials, nothing ever happens.
That's what I used to think, too. But I've come to think the skeptics have over-corrected. Yes, randomized trials have shown the magical correlations are not causal. But if you start with non-insane expectations, the trials look like weak but positive evidence. And if you consider what we know about biology and evolution, I think the balance of evidence tips pretty clearly in the direction that people with low-ish levels would be wise to supplement.
Am I certain that vitamin D is beneficial for people with low-ish levels? Absolutely not! But I claim that's the best bet given the limits of our knowledge.
**The classical view: Boring bone vitamin**
Most vitamins are "ingredients" that the body uses to do stuff. Vitamin D is more [...]
---
**Outline:**
(01:19) The classical view: Boring bone vitamin
[... 14 more sections]
---
First published:
June 23rd, 2026
Source:
https://www.lesswrong.com/posts/sF5gAxnmifQe2TBNt/the-worthlessness-of-vitamin-d-is-mildly-exaggerated
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

Scatter plot showing cancer mortality per 100,000 population versus solar radiation index by state. — **"The worthlessness of vitamin D is mildly exaggerated" by dynomight** Jun 29, 2026
Show notes

For a while there, many people thought vitamin D was magical—that it could improve bones, the heart, infections, cancer, heart disease, longevity, even mental health. But among people I respect, opinion is now overwhelmingly that taking vitamin D does nothing unless you're severely deficient. The central argument is that while vitamin D levels are correlated with ~all positive health outcomes, when you actually test vitamin D supplements against placebo in randomized trials, nothing ever happens.
That's what I used to think, too. But I've come to think the skeptics have over-corrected. Yes, randomized trials have shown the magical correlations are not causal. But if you start with non-insane expectations, the trials look like weak but positive evidence. And if you consider what we know about biology and evolution, I think the balance of evidence tips pretty clearly in the direction that people with low-ish levels would be wise to supplement.
Am I certain that vitamin D is beneficial for people with low-ish levels? Absolutely not! But I claim that's the best bet given the limits of our knowledge.
**The classical view: Boring bone vitamin**
Most vitamins are "ingredients" that the body uses to do stuff. Vitamin D is more [...]
---
**Outline:**
(01:19) The classical view: Boring bone vitamin
[... 14 more sections]
---
First published:
June 23rd, 2026
Source:
https://www.lesswrong.com/posts/sF5gAxnmifQe2TBNt/the-worthlessness-of-vitamin-d-is-mildly-exaggerated
---
Narrated by TYPE III AUDIO.
---
**Images from the article:**
*Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.*

"What is up with e/acc?" by KatjaGrace Jun 27, 2026

Show notes

I was chatting with someone tonight about a planned documentary; they had interviewed various people in AI safety, and we got to discussing who they should talk to from an e/acc (effective accelerationist) perspective. I also watched The AI Doc recently, and they also dedicated a serious chunk of it to ‘optimists’ with e/acc founder ‘Beff Jezos’ perhaps given the most screen time. Here and elsewhere, people seem to treat e/acc as a substantial contrary-to-AI-safety cultural movement, worth engaging with.
But is it? Are there even many e/accs? There seem to be very few notable ones. Beff Jezos is perhaps the most prominent, and aside from founding e/acc he seems to be not distinguishable on casual perusal from a normal crank (his company claims to be developing super-energy-efficient computing hardware based on probabilistic processes).
The intellectual tenets of e/acc seem to be pretty unclear.
The apparent counterarguments to AI risk raised in situations like the AI doc seem to be widely agreed on by everyone in AI Safety, so don’t explain the disagreement. For instance: