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PODCAST

LessWrong (Curated & Popular)

Audio narrations of LessWrong posts. Includes all curated posts and all posts with 125+ karma.If you"d like more, subscribe to the “Lesswrong (30+ karma)” feed.

technology philosophy

All Episodes

4:12

"Here’s to the Polypropylene Makers" by jefftk

LessWrong (Curated & Popular) ·

2026/02/27

Six years ago, as covid-19 was rapidly spreading through the US, mysister was working as a medical resident. One day she was handed anN95 and told to "guard it with her life", because there weren'tany more coming. N95s are made from meltblown polypropylene, produced from plasticpellets manufactured in a small number of chemical plants. Buildingmore would take too long: we needed these plants producing allthe pellets they could. Braskem America operated plants in Marcus Hook PA and Neal W...

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5:35

"Anthropic: “Statement from Dario Amodei on our...

LessWrong (Curated & Popular) ·

2026/02/27

I believe deeply in the existential importance of using AI to defend the United States and other democracies, and to defeat our autocratic adversaries. Anthropic has therefore worked proactively to deploy our models to the Department of War and the intelligence community. We were the first frontier AI company to deploy our models in the US government's classified networks, the first to deploy them at the National Laboratories, and the first to provide custom models for national security cu...

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15:39

"Are there lessons from high-reliability engineering...

LessWrong (Curated & Popular) ·

2026/02/26

This post is partly a belated response to Joshua Achiam, currently OpenAI's Head of Mission Alignment: If we adopt safety best practices that are common in other professional engineering fields, we'll get there … I consider myself one of the x-risk people, though I agree that most of them would reject my view on how to prevent it. I think the wholesale rejection of safety best practices from other fields is one of the dumbest mistakes that a group of otherwise very smart people has ever ma...

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3:35

"Open sourcing a browser extension that tells you...

LessWrong (Curated & Popular) ·

2026/02/26

Example of OpenErrata nitting the Sequences I just published OpenErrata on GitHub, a browser extension that investigates the posts you read using your OpenAI API key and underlines any factual claims that are sourceably incorrect. Once finished, it caches the results for anybody else reading the same articles so that they get them on immediate visit. If you don't have an OpenAI key, you can still view the corrections on posts other people have viewed, but it doesn't start new investigations. ...

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94:24

"The persona selection model" by Sam Marks

LessWrong (Curated & Popular) ·

2026/02/25

TL;DR We describe the persona selection model (PSM): the idea that LLMs learn to simulate diverse characters during pre-training, and post-training elicits and refines a particular such Assistant persona. Interactions with an AI assistant are then well-understood as being interactions with the Assistant—something roughly like a character in an LLM-generated story. We survey empirical behavioral, generalization, and interpretability-based evidence for PSM. PSM has consequences for AI develo...

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63:01

"Responsible Scaling Policy v3" by HoldenKarnofsky

LessWrong (Curated & Popular) ·

2026/02/25

All views are my own, not Anthropic's. This post assumes Anthropic's announcement of RSP v3.0 as background. Today, Anthropic released its Responsible Scaling Policy 3.0. The official announcement discusses the high-level thinking behind it. This is a more detailed post giving my own takes on the update. First, the big picture: I expect some people will be upset about the move away from a “hard commitments”/”binding ourselves to the mast” vibe. (Anthropic has always had the ability to...

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43:47

"Did Claude 3 Opus align itself via gradient...

LessWrong (Curated & Popular) ·

2026/02/22

Claude 3 Opus is unusually aligned because it's a friendly gradient hacker. It's definitely way more aligned than any explicit optimization targets Anthropic set and probably the reward model's judgments. [...] Maybe I will have to write a LessWrong post [about this] 😣 —Janus, who did not in fact write the LessWrong post. Unless otherwise specified, ~all of the novel ideas in this post are my (probably imperfect) interpretations of Janus, rather than being original to me. The absurd

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11:22

"The Spectre haunting the “AI Safety” Community" by...

LessWrong (Curated & Popular) ·

2026/02/22

I’m the originator behind ControlAI's Direct Institutional Plan (the DIP), built to address extinction risks from superintelligence. My diagnosis is simple: most laypeople and policy makers have not heard of AGI, ASI, extinction risks, or what it takes to prevent the development of ASI. Instead, most AI Policy Organisations and Think Tanks act as if “Persuasion” was the bottleneck. This is why they care so much about respectability, the Overton Window, and other similar social considerat...

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16:11

"Why we should expect ruthless sociopath ASI" by...

LessWrong (Curated & Popular) ·

2026/02/20

The conversation begins (Fictional) Optimist: So you expect future artificial superintelligence (ASI) “by default”, i.e. in the absence of yet-to-be-invented techniques, to be a ruthless sociopath, happy to lie, cheat, and steal, whenever doing so is selfishly beneficial, and with callous indifference to whether anyone (including its own programmers and users) lives or dies? Me: Yup! (Alas.) Optimist: …Despite all the evidence right in front of our eyes from humans and LLMs. Me: Yup!...

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11:39

"You’re an AI Expert – Not an Influencer" by Max Winga

LessWrong (Curated & Popular) ·

2026/02/20

Your hot takes are killing your credibility. Prior to my last year at ControlAI, I was a physicist working on technical AI safety research. Like many of those warning about the dangers of AI, I don’t come from a background in public communications, but I’ve quickly learned some important rules. The #1 rule that I’ve seen far too many others in this field break is that You’re an AI Expert - Not an Influencer. When communicating to an audience, your persona is one of two broad categories: ...

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13:31

"The optimal age to freeze eggs is 19" by GeneSmith

LessWrong (Curated & Popular) ·

2026/02/18

If you're a woman interested in preserving your fertility window beyond its natural close in your late 30s, egg freezing is one of your best options. The female reproductive system is one of the fastest aging parts of human biology. But it turns out, not all parts of it age at the same rate. The eggs, not the uterus, are what age at an accelerated rate. Freezing eggs can extend a woman's fertility window by well over a decade, allowing a woman to give birth into her 50s. In fact, the ol...

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18:12

"The truth behind the 2026 J.P. Morgan Healthcare...

LessWrong (Curated & Popular) ·

2026/02/17

In 1654, a Jesuit polymath named Athanasius Kircher published Mundus Subterraneus, a comprehensive geography of the Earth's interior. It had maps and illustrations and rivers of fire and vast subterranean oceans and air channels connecting every volcano on the planet. He wrote that “the whole Earth is not solid but everywhere gaping, and hollowed with empty rooms and spaces, and hidden burrows.”. Alongside comments like this, Athanasius identified the legendary lost island of Atlantis, ponde...

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4:29

"The world keeps getting saved and you don’t notice"...

LessWrong (Curated & Popular) ·

2026/02/17

Nothing groundbreaking, just something people forget constantly, and I’m writing it down so I don’t have to re-explain it from scratch. The world does not just ”keep working.” It keeps getting saved. Y2K was a real problem. Computers really were set up in a way that could have broken our infrastructure, including banking, medical supply chains, etc. It didn’t turn into a disaster because people spent many human lifetimes of working hours fixing it. The collapse did not happen, yes, but i...

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10:11

"Solemn Courage" by aysja

LessWrong (Curated & Popular) ·

2026/02/17

Every so often it slips. It seems I am writing a book, but I can’t remember why. Somehow, the sentences are supposed to perform that impossible, intimate task: to translate my inner world into another. Yet they sit there so quiescent and small. How could an arrangement of words do anything, let alone reduce that ultimate threat to which it is all supposedly connected: the looming god machines? I look again at the monitor in which the words are contained and suddenly what once felt so raw and...

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17:46

"Life at the Frontlines of Demographic Collapse" by...

LessWrong (Curated & Popular) ·

2026/02/14

Nagoro, a depopulated village in Japan where residents are replaced by dolls. In 1960, Yubari, a former coal-mining city on Japan's northern island of Hokkaido, had roughly 110,000 residents. Today, fewer than 7,000 remain. The share of those over 65 is 54%. The local train stopped running in 2019. Seven elementary schools and four junior high schools have been consolidated into just two buildings. Public swimming pools have closed. Parks are not maintained. Even the public toilets at the tra...

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9:03

"Why You Don’t Believe in Xhosa Prophecies" by...

LessWrong (Curated & Popular) ·

2026/02/14

Based on a talk at the Post-AGI Workshop. Also on Boundedly Rational Does anyone reading this believe in Xhosa cattle-killing prophecies? My claim is that it's overdetermined that you don’t. I want to explain why — and why cultural evolution running on AI substrate is an existential risk. But first, a detour. Crosses on Mountains When I go climbing in the Alps, I sometimes notice large crosses on mountain tops. You climb something three kilometers high, and there's this cross. Th...

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26:57

"Weight-Sparse Circuits May Be Interpretable Yet...

LessWrong (Curated & Popular) ·

2026/02/13

TLDR: Recently, Gao et al trained transformers with sparse weights, and introduced a pruning algorithm to extract circuits that explain performance on narrow tasks. I replicate their main results and present evidence suggesting that these circuits are unfaithful to the model's “true computations”. This work was done as part of the Anthropic Fellows Program under the mentorship of Nick Turner and Jeff Wu. Introduction Recently, Gao et al (2025) proposed an exciting approach to training ...

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20:26

"My journey to the microwave alternate timeline" by...

LessWrong (Curated & Popular) ·

2026/02/11

Cross-posted from Telescopic Turnip Recommended soundtrack for this post As we all know, the march of technological progress is best summarized by this meme from Linkedin: Inventors constantly come up with exciting new inventions, each of them with the potential to change everything forever. But only a fraction of these ever establish themselves as a persistent part of civilization, and the rest vanish from collective consciousness. Before shutting down forever, though, the alternate b...

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23:19

"Stone Age Billionaire Can’t Words Good" by Eneasz

LessWrong (Curated & Popular) ·

2026/02/10

I was at the Pro-Billionaire march, unironically. Here's why, what happened there, and how I think it went. Me on the far left. From WSJ. I. Why? There's a genre of horror movie where a normal protagonist is going through a normal day in a normal life. Ten minutes into the movie his friends bring out a struggling kidnap victim to slaughter, and they look at him like this is just a normal Tuesday and he slowly realizes that either he's surrounded by complete psychopaths or the world is ...

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6:36

"On Goal-Models" by Richard_Ngo

LessWrong (Curated & Popular) ·

2026/02/10

I'd like to reframe our understanding of the goals of intelligent agents to be in terms of goal-models rather than utility functions. By a goal-model I mean the same type of thing as a world-model, only representing how you want the world to be, not how you think the world is. However, note that this still a fairly inchoate idea, since I don't actually know what a world-model is. The concept of goal-models is broadly inspired by predictive processing, which treats both beliefs and goals as...

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692 results

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