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Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.

• Was making polite chitchat with a local older friend (who used to be sec. of state, no slouch) at an event yesterday. He tried to send me a video of Bernie talking about AI, how we were all cooked etc. I said "Why would I want to watch that? I'm not going to watch that." and he took offense as if I were the one who was being rude. It's been weighing on me today, feeling weird about being honest and/or rude here. I try to be agreeable, not poop in the punch bowl. But doomerism at a nice party?

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Front-end web developer at Paravel and co-host of the ShopTalk Show podcast; blogs at daverupert.com.

• Instrument standup: Bought a bass amp yesterday and my son schemed up a plan to trade in my old Epiphone Thunderbird and an unused banjo, for a Fender Jazz bass. So we did that. And now I have a new bass guitar. Cool.

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Statistician at Columbia; writes Statistical Modeling, Causal Inference, and Social Science, and wrote Bayesian Data Analysis.

• Meritocracy to-morrow and meritocracy yesterday – but never meritocracy to-day

  Alice couldn’t help laughing, as she said, “I don’t want you to hire me – and I don’t care for jam.” “It’s very good jam,” said the Queen. “Well, I don’t want any to-day, at any rate.” “You couldn’t have

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Creator of Claude Code at Anthropic.

• Projects have changed not only how I interact with Claude but how I code. I stopped managing sessions. I just send thoughts as they come, Claude splits them into threads, and the project remembers how I work. It's where I do a ton of my coding now. [screenshot: my actual prompts for claude code cli yesterday]
  Quoting@ClaudeDevsToday we're rolling out Projects in Claude Code on desktop and web. A project is one conversation with Claude. It splits the work into threads itself, runs them as parallel cloud sessions, passes context between them, and keeps going when you leave. In beta for select users.

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Former options market maker who writes Moontower, a newsletter on trading, volatility, decision-making and how to think about risk outside markets too.

• The option arbitrage stuff via yesterday's poll, @DeepDishEnjoyer dividend, and the silver early exercise post has spawned a bunch of chats on TL & DMs. Seems to be a lot of people screwing with options but missing fundamental education. Another first-principles type example:

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Entrepreneur and founder of Blueprint. Publishes a detailed, freely available longevity protocol documenting the food, supplements, devices and measurements he uses on himself.

• We were surprised yesterday to learn that Kate was being asked to fill her vagina with ultrasound gel. The MRI was to characterize her endometriosis. A disease where endometrial tissue develops outside the uterus and grows. It's a gnarly and painful disease with serious health complications. It affects 1 in 10 women and currently takes on average 6.6 years to diagnose. We hustled and diagnosed Kate's endometriosis in 42 days via four speciality different tests (blood, MRI, salvia, transvaginal ultrasound). The fastest and most comprehensive ever, I think. We are doing this MRI because we have…
  Quoting@_katetoloI had to fill my vagina with ultrasound gel yesterday for an MRI... I had no idea this was a protocol for measuring endometriosis! how cool It's a technique called vaginal opacification... the vagina is normally a collapsed space, and on an MRI, collapsed walls are hard to tell apart from the tissu…

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• Yesterday I flew LAS->NYC, noticed a white woman at the lounge with a sticker like the "I voted!" stickers but it said "I like ICE". Then she and her husband pushed aside wheelchairs to "preboard", announcing they were in first class Then they were rude to the flight attendants. The worst people.

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President of the European Commission since 2019; previously Germany's defence minister.

• In yesterday’s SOTEU speech, I made clear that the EU must continue applying pressure on Russia, taking every possible step to weaken its war machine. The adoption of the Graham Bill by the US House of Representatives sends a clear message. My friend, Senator Graham, strongly believed targeted and coordinated action on both sides of the Atlantic could make the difference in ending the war. I hope this important opportunity is seized, in the interest of peace.

  EuropeRussiaRelated

Web standards author and speaker; wrote the CSS: The Definitive Guide series and co-founded the An Event Apart conference.

• I just deleted a post I made yesterday, because it led some people to reasonably read things into it that I didn’t intend. That’s on me, as I wrote it badly and without considering contexts beyond what I was thinking at the time. My apologies to anyone who read it and was disheartened or upset; I’m happy to discuss further in DMs with those who saw it and would like clarification on what I meant.

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Writes The Pragmatic Engineer, the software-engineering newsletter, and wrote The Software Engineer's Guidebook. Formerly an engineering manager at Uber, and at Microsoft/Skype and Skyscanner before that.

• BlueskyFresh data from GitHub: Agent-generated PRs have exploded in size. 9x the last 8 months (!!) No signs of slowing down. This is why everyone is rethinking code reviews, deploys, possibly even o11y thanks to the GH team for sharing this data with me! (Slide from my talk yesterday)

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• x.comFresh data from GitHub: Agent-generated PRs have exploded in size. 9x the last 8 months (!!) No signs of slowing down. This is why everyone is rethinking code reviews, deploys, possibly even o11y thanks @kdaigle + team for the stat! (Slide from my talk yesterday)

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Author and journalist writing on food, plants and consciousness. Professor at UC Berkeley and co-founder of its Center for the Science of Psychedelics.

• The Microdose Reports on yesterday's FDA’s hearing on psychedelic drugs

  themicrodose.substack.com

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Co-founder and CTO of Honeycomb; previously an infrastructure engineer at Parse, Facebook and Linden Lab, and co-author of Observability Engineering.

• I wrote a new piece yesterday, called "Confessions of an Unrepentant Slop Snob", about my escalating rage at AI-generated text. It includes a framework for thinking about when AI involvement is fine -- just another tool -- and when it lands as a violation.

  charity.wtf

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Investor and writer. Previously a partner at Andreessen Horowitz and a product leader at Twitter, Facebook, Snap and Microsoft. Writes essays and memos at sriramk.com.

• someone asked me yesterday: who is the one figure that would be able to start an AI eval organization and be globally seen as neutral and trusted both technically and ideologically and financially. the only name that popped into my head was @ID_AA_Carmack (not that he has any interest in doing so!).

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Researcher and science writer. Co-founder and editor at Works in Progress magazine, formerly a researcher at Our World in Data, and author of the Scientific Discovery newsletter on science, global health and medical innovation.

• BlueskyI spoke too soon! Got about a dozen emails from bots trying to collect rewards from my bug bounty since yesterday. 4 were legitimate errors though very minor, relating to my vaccine discovery dataset.
  Quoting@scientificdiscovery.devI'm having a similar experience, although have only received a few emails like this so far. Some are so stingy about tokens that they don't start trying to check the work unless I confirm it's eligible for a reward.

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• x.comOrdered a “baklava sandwich” yesterday, not knowing what that meant. It turned out to be layers of baklava with cream on top and pistachio ice cream inside. Probably in the top 3 desserts in my life tbh.

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• BlueskyOrdered a "baklava sandwich" yesterday, not knowing what that meant. It turned out to be layers of baklava with cream on top and pistachio ice cream inside. Probably in the top 3 desserts in my life tbh.

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Writer of Lenny's Newsletter and host of Lenny's Podcast, covering product, growth and career in tech. Previously a product lead at Airbnb. Also an angel investor and advisor.

• Still processing from yesterday's event (one of the most meaningful days of my life)— more to come—but a few quick things for now: 1. Thank you to everyone who came. You are what made it special. 2. There's so much need for IRL community. I've rarely felt this kind of pull for anything I've done. Wow. 3. All of the talks will be posted to my YT channel in the coming weeks. Get excited. 4. An unbelievable thank-you to the @Stripe team for helping me put this event on. It takes something special to create an event with 1,000+ PMs that has such great vibes. If you think they're great at payments…

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General partner at Benchmark Capital for over two decades; was the lead analyst on Amazon's IPO before moving into venture capital. Writes Above the Crowd on tech and marketplace economics.

• Sound like many employees at Anthropic share Jacob's POV, as many posted yesterday that (1) they agree, and (2) said that many more inside the company do also. It would be useful to name this "belief system" so that we can talk about it in a reasonable way. I suspect "doomer" seems derogatory, and "accelerationist" has others uses. If there a word we can use so that we can have proper discourse? I'm very serious. I think it would be helpful.

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Computer science professor at Georgetown University and author of Deep Work, Digital Minimalism and Slow Productivity; writes about focus, technology and work at calnewport.com and hosts the Deep Questions podcast.

• Superintelligence is a Fairy Tale. But Chasing It Can Still Cause Harm.

  Yesterday, multiple Anthropic employees casually announced online that they thought the types of AI they’re building could kill billions of people. Not in some distant ...

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Computer science professor at Georgetown University and author of Deep Work, Digital Minimalism and Slow Productivity; writes about focus, technology and work at calnewport.com and hosts the Deep Questions podcast.

• Anthropic Just Threatened to Kill Billions of People. This Is Not Okay.

  Yesterday, Jacob Coxon, an Anthropic engineer, resigned. As he ​explained on X​: “[OpenAI and Anthropic] are racing straight to self-improving superintelligence and gambling with our ...

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Mathematician and Senior Lecturer in the Mathematics department at Columbia University. Author of the book Not Even Wrong and of the long-running physics blog of the same name.

• A Modest Proposal

  The announcement yesterday by OpenAI of a solution to the Millennium Prize Navier-Stokes problem has been causing a great deal of discussion among mathematicians. There’s a lot to be said about this story and its implic…

  OpenAIRelated

British comics writer and novelist (Transmetropolitan, Planetary, The Authority, Gun Machine). Keeps a public daily notebook logging what he reads, watches and listens to.

• 8sep26

  Didn’t get enough nailed down yesterday. I have the full shape of two stories, but I really wanted to get into scripting and to firm

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Computer scientist and director of the MIT Digital Currency Initiative; her research covers distributed systems, databases and digital currency.

• Quick explanation and thoughts on yesterday's Liquid hack:

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Swedish designer and programmer. Designed early Spotify, worked at Facebook and Figma, and created the Inter typeface.

• Astra in codex is a thirsty thing. A single agent burned through all usage for a $200/mo account in about 14 hours (I took one of my account limit resets yesterday afternoon.)

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Programmer and writer; co-founder of Stack Overflow and Discourse, and author of the Coding Horror blog, which he has written since 2004.

• yesterday Dr. Betsy asked one of our daughters if there are any new musical artists that cover wealth inequality. She thought for a bit, and a little longer still, and said, "no, they're all nepo babies." 😬 that's the first line of this (incredible) song

  youtube.com

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Co-founder of Foundry Group and of Techstars. Has blogged at Feld Thoughts since 2004 and has written or co-written nine non-fiction books on startups and venture capital.

• Chapter 26.1: The Feed Sable finds the FBI drew its own search box: fourteen empty parking lots. "They walked out of the search area yesterday. Probably in daylight. Possibly past one of the parking lots with Americans standing in it."

  zeroknowledge.ink

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Co-founder of Foundry Group and of Techstars. Has blogged at Feld Thoughts since 2004 and has written or co-written nine non-fiction books on startups and venture capital.

• x.comAmy texted me this list yesterday. I'm 60, closing in on 61, and thinking more about what I actually care about. The real luxuries in life: time, health, a quiet mind, slow mornings, rest without guilt, calm and "boring" days, people who love you back.

  feld.com

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• BlogThe Real Luxuries In Life

  Labor Day weekend has always been the back to school marker for me. I'm 60, closing in on 61, and thinking a lot more about what I actually care about. Amy texted me a list yesterday.

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Co-founder and CEO of Every. Writes the Chain of Thought column about working with AI tools and hosts the podcast AI & I.

• Astra one-shotted the first draft of its own vibe check for @every 🤯 we learned Astra was launching at 3 am yesterday morning. by 7 am we had a 3,000 word vibe check written. i can't tell you how impressive it is that i woke up to a google doc with a well-written, well formatted article with all of the usual sections, a good headline, and even appropriate screenshots. written in @kplikethebird's i didn't realize Katie hadn't written it herself, she just prompted Astra and it did the rest totally new world!

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Mathematical biologist; Senior Lecturer in the Department of Mathematical Sciences at the University of Bath and author of The Maths of Life and Death and How to Expect the Unexpected.

• x.comI was on BBC Inside Science yesterday with Roland Pease as Presenter's Friend. We talked about a new way of dating an artefact, the appearance of a decagon on Saturn and a about a hint of dark matter. You can read all about it on my substack here: https://t.co/A6f2H6rcEg? 1/2

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• BlueskyI was on BBC Inside Science yesterday with Roland Pease as Presenter's Friend. We talked about a new way of dating an artefact, the appearance of a decagon on Saturn and a about a hint of dark matter. You can read all about it on my substack here: kityates.substack.co...? 1/2

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Venture capitalist and founder of Theory Ventures, previously a partner at Redpoint. Writes a near-daily blog on startups, SaaS metrics, data and AI.

• Meta launched two things yesterday : a state-of-the-art model & a new pricing system for foundation models. Muse Spark propels US open source models to the frontier. Meanwhile, the pricing system resets the industry’s economics.

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Chilean web engineer building web experiences since 2006; co-founder of Media Creators and writes at iolivares.com.

• Yesterday I worked for ~20hs with my agents using Cursor and Claude and when I moved to sleep time I turned on the "autonomous" skill to all my agents. Today, checking the work done, almost 40% was blocked because reasons and when I ask they say "Sorry, my work was left unfinished..." Weird... computation outage?

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Co-founder and CEO of Linear; previously principal designer at Airbnb, where he led the Design Language System, and founding designer at Coinbase.

• I've been recently creating various loops of customer signals with the @linear agent. Yesterday created one about when customers mention AI workflows, and getting a report in my inbox every morning

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Co-founder of Foundry Group and of Techstars. Has blogged at Feld Thoughts since 2004 and has written or co-written nine non-fiction books on startups and venture capital.

• Chapter 22.1: The Log Dolores has worked the same hospital basement for twenty-two years. This morning a pump refuses a firmware update it would have accepted yesterday. "I want my normal one. I'm used to it." "That one is being difficult."

  zeroknowledge.ink

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American software engineer; worked on code-server at Coder and teaches TypeScript and open-source contribution. Publishes at joeprevite.com.

• "today your day is going to be full of wins and luck will follow you" been telling myself this yesterday and today - 2 new signups for wellness coaching - finally found solution for treating weeds - found buyer for desk i'm selling - neighbor offered to help fix car (saving +$2k) it works
  Quoting@thebeautyofsaasreminder on how to get lucky >wake up >before doing anything, walk up to the bathroom (first thing in the morning) >look at yourself in the mirror and tell yourself that your day is going to be full of wins and that luck will follow you >witness things you have never seen before

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German developer; founder and lead developer of Mastodon, the decentralized open-source social network.

• #Mastodon (the band) - The Vanishing, from their new album that was released yesterday. https://www.youtube.com/watch?v=Mm77ggDFcPU #NP #NowPlaying

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Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.

• I'll be at Ilkley Literature Festival on the 11th October - and general booking opened yesterday! https://t.co/w8JaxB7m3K Thanks for the invite @ilkleylitfest

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Indian software developer and prolific blogger on PHP, Laravel and JavaScript; open-source enthusiast publishing near-daily at amitmerchant.com.

• You learn about something every day. Yesterday, I learned about something called a "Non-breaking hyphen". Normal hyphen - The browser can usually break the line at this character. Non-breaking hyphen - A hyphen that prevents a line break at the hyphen.

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Indian software developer and prolific blogger on PHP, Laravel and JavaScript; open-source enthusiast publishing near-daily at amitmerchant.com.

• I think it's the first time in the history of https://t.co/oYpGKlHipk that the daily traffic crossed 50,000 visits. It happened yesterday! 🚀

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AI research engineer working on large language models. He writes the Ahead of AI newsletter and is the author of Build a Large Language Model (From Scratch).

• Whoa, Meta released a new open-weight LLM yesterday, something that hasn't happened since the good old Llama days. Their Meta Muse Glimmer model is a 30B multimodal reasoning model with a Gemma-like architecture design. (“Glimmer” is probably a wordplay on “Spark,” the more likely capable model from which Glimmer was distilled. Muse Spark is only available through Meta’s Model API, though.) Architecture-wise, here are some of the main points: 1. "Only" a 131k context window, compared to Qwen3.6 and Gemma 4, which support 2x that natively; it's reasonable, but maybe on the shorter end in the a…

  LLMsRelated

Cryptographer; teaches cryptography at Johns Hopkins and writes A Few Thoughts on Cryptographic Engineering.

• Some thoughts about Anthropic’s new cryptanalysis results

  Yesterday Anthropic published two new cryptanalysis results, both outputs of Claude Mythos, their (still) unreleased advanced model. The first of these results attacks a signature scheme called HAWK, while the second is…

  AnthropicRelated

Swedish open source developer; creator and lead maintainer of curl and libcurl, and a co-founder of the Rockbox project.

• Workshop Basel day two

  If you missed it. I already described day one. Caffeinated and ready, we all gathered in the same spacious room as yesterday, but seated in new places as “suggested” by our captain. Some of us even remembered to move ov…

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American author of The Obstacle Is the Way, Ego Is the Enemy and Stillness Is the Key. Writes the Reading List book-recommendation email (started 2008) and owns The Painted Porch bookstore in Bastrop, Texas. Hosts The Daily Stoic podcast.

• 39 (Or So) Lessons On The Way To 39

  Well, I’m now almost 40. Like officially almost 40. I woke up yesterday in Cle Elum, Washington, ran 20 miles and then turned 39. I did a little talk for Amazon and then flew home, getting in very late and very tired. I…

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Creator of Ruby on Rails, CTO of 37signals, and creator of Omarchy.

• The Rape of Britain

  Rupert Lowe, member of the British Parliament and leader of the Restore Britain party, released The Rape Gang Inquiry yesterday. It details the industrial-scale sexual atrocities committed by predominantly Pakistani Mus…

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Cryptographer; teaches cryptography at Johns Hopkins and writes A Few Thoughts on Cryptographic Engineering.

• The future of Siri, or: why private inference isn’t private enough

  Yesterday Apple announced a big step towards deploying real AI in their Siri ecosystem. In most ways this is good and inevitable: Siri is one of the world’s most widely-used voice agents, and it would be good if it didn…

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Scottish software developer on the Statamic core team; runs a one-person business maintaining Statamic addons such as Runway and writes at duncanmcclean.com.

• Man oh man, it's hard to start a Saas from the ground up. I think my SEO efforts are paying off. I had users 2 & 3 sign up for @clearinghousehq yesterday out of nowhere. One cancelled pretty quickly... but good to know that _something_ is working.

  SaaSRelated

Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• State of Agentic Coding #5 with @mitsuhiko.at is live. In this episode: - death of the IDE premature? - what's with all the bugs - will future models fix yesterday's AI code? - token abuse, slowing down, and more! YT: www.youtube.com/watch?v=qCpY... Spotify:

  open.spotify.com

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President of the United States, the 45th from 2017 to 2021 and, as of 2026, the 47th; before politics a New York property developer who ran the Trump Organization, and the host of The Apprentice from 2004 to 2015.

• Merry Christmas to all, including the Radical Left Scum that is doing everything possible to destroy our Country, but are failing badly. We no longer have Open Borders, Men in Women’s Sports, Transgender for Everyone, or Weak Law Enforcement. What we do have is a Record Stock Market and 401K’s, Lowest Crime numbers in decades, No Inflation, and yesterday, a 4.3 GDP, two points better than expected. Tariffs have given us Trillions of Dollars in Growth and Prosperity, and the strongest National Security we have ever had. We are respected again, perhaps like never before. God Bless America!!! Pr…

  inflationAmericaRelated

Artist and writer based in Oakland, California; author of How to Do Nothing and Saving Time, and a longtime teacher of digital art.

• scenes from the repair advice clinic I helped organize yesterday at local economy in oakland 🤗 it went well enough that we might do it again!

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Cryptographer; teaches cryptography at Johns Hopkins and writes A Few Thoughts on Cryptographic Engineering.

• From yesterday: the UK is demanding another backdoor in Apple’s encryption.

  ft.com

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Mathematician and maker of the 3Blue1Brown YouTube channel, which explains mathematics through animation. Creator of the open-source Manim animation library and founder of the Summer of Math Exposition.

• Welp, somewhat embarrassingly, yesterday this account was briefly compromised and someone posing as me promoted a crypto project supposedly "tokenizing" manim. Thank you to those of you who quickly flagged it as spam and alerted me to the problem. For future reference, it's a safe bet that you'll never see me creating and promoting a meme coin.

  cryptoRelated

Programmer and writer; co-wrote The Rust Programming Language and worked on Rust's documentation for years.

• Choosing Languages

  I tried to write this post yesterday, but I didn’t like my approach there. Last night, I had a conversation with one of my best friends about it, and he encouraged me to write this, but in a different way. I think this…

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Writes jvns.ca, turning "hard and scary" topics — networking, debugging, Linux internals — into plain explanations and hand-drawn comics. Publishes Wizard Zines, illustrated programming zines. Software developer based in Montreal.

• Importing a frontend Javascript library without a build system

  I like writing Javascript without a build system and for the millionth time yesterday I ran into a problem where I needed to figure out how to import a Javascript library in my code without using a build system, and it…

  JavaScriptRelated

Writer and consultant on technology, organizations and history; founded the blog Ribbonfarm and now writes the Contraptions newsletter.

• Wrote a rare old-fashioned taxonomy type post yesterday

  open.substack.com

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Programmer and author of Modern C++ Design and The D Programming Language; a lead contributor to the D language.

• Thought all day yesterday of a /simple/ way to pass arguments to ctors in any order. ChatGPT would suggest hecatombs of convoluted code! I assume many of y'all know about this single-function solution but just in case:

  godbolt.org

  OpenAIRelated

Co-founder and partner at Union Square Ventures in New York. Has written the AVC blog almost every day since 2003, on venture capital, startups, music and crypto.

• @aweissman @whitneymcn i heard this Tedeschi Trucks cover of Derek & The Dominos yesterday on the radio driving from Bridgehampton to East Hampton

  youtube.com

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Swedish software developer writing about tooling, working from home and running a software business at seastone.io.

• I had an amazing call with @ashmaurya yesterday and today my @Todoist is already full of next-steps. :) Thank you so much for all the insights!

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Author and clean-energy analyst who writes on solar cost curves.

• Solar doesn’t need a “breakthrough”. It’s a breakthrough on it’s own.

  Yesterday, Tyler Cowan, who I’m a major fan of, wrote a piece for Bloomberg View arguing that solar needs more R&D for a true green energy breakthrough.

  solarenergyRelated