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Cal Henderson
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Happy 10th birthday to Slack 🎉 Happy 20th birthday to Flickr 🎉 Time for me to take a little break 😅
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19 September
Economist; writes In My Tribe, and wrote The Three Languages of Politics.
18 September
Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.
Friday afternoon reminder to not empty your inbox at the expense of someone else's. This is the weekend I get my wood in (i.e. have pellets delivered) so I'm thinking of chillier days even though it's 70° outside. Trust me, you'll feel better if you make some plans for what's ahead, however you interpret that. Have a good weekend. Image credit: Library of Congress, on Flickr Commons flickr.com
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17 September
Writer of kottke.org, one of the oldest blogs on the web, published since 1998 and supported by its members. He writes about art, technology, science, design and visual culture.
16 September
Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.
I did a short talk about Flickr Commons today for local heritage organizations on the Isle of Wight. Do you know an organization which would be a good fit for Flickr Commons? Let me know or have them get in touch with me. docs.google.com
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15 September
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'm excited to be appearing at Gloucester History Festival this Autumn - you can catch me on the 20th Sept at 4pm, at Blackfriars Priory. https://t.co/9kwJ2iJTr8 Come along and say hello—I can't wait to see you there! @gloshistfest #GlosHistFest26 Related
Economist; writes In My Tribe, and wrote The Three Languages of Politics.
11 September
Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.
Friday afternoon reminder to not empty your inbox at the expense of someone else's. My "big plans" today involve sawhorses and telephones and catching up on my newspaper reading. Argue all you want about AI, the analog world will be here when you're done, mostly. Schedule those emails. Have a good weekend. Image credit: State Library of New South Wales, on Flickr Commons flickr.com
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Co-founder and CEO of Stripe and co-founder of the Arc Institute. Keeps a personal site of reading lists, open questions and notes on scientific progress and how research is funded.
Architects oppose the kinds of buildings that most people like. (I’ve wondered if one could further corroborate this by using Flickr/Instagram or similar to investigate the building traits that correlate with photo frequency.) Quoting @SCP_Hughes Does the public prefer traditional architecture? Half a century of surveys find: https://t.co/SojOiJGEbV - Between 60 and 95 percent prefer traditional architecture; - This pattern holds across gender, class, race, nationality and political views; - More traditional densification schemes seem to at… Related
Economist; writes In My Tribe, and wrote The Three Languages of Politics.
10 September
Economist; writes In My Tribe, and wrote The Three Languages of Politics.
9 September
Machine learning engineer and consultant focused on RAG and retrieval systems. He writes about applied AI engineering at jxnl.co and is the author of the instructor library.
did you miss my ai engineer talk? i'm doing a slightly updated version about how i use codex to automate a lot of my work so i can focus on even bigger projects, work more closely with people, and think higher level 1. how to bring context into codex 2. how to get work done 3. how to give codex the power to do anything on my computer sept 10th 2pm EST maven.com
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Economist; writes In My Tribe, and wrote The Three Languages of Politics.
8 September
Mathematician at UCLA, working mainly in harmonic analysis and partial differential equations. Writes What's new, a long-running blog on their research, open problems and expository notes.
I wrote recently about how the collection of good, fruitful open problems is now being mined in a non-renewable fashion, leading to the potential scenario of these problems becoming scarce. This may seem unintuitive at first, since the set of possible problems one could ask is infinite. Perhaps the following analogy can help: a country or region can suffer a critical shortage of drinking water while simultaneously being surrounded by a massive ocean. One can easily generate any number of open problems in mathematics at will, such as working out the 10^10^10th digit of pi. But the vast majorit… Related
4 September
Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.
Friday afternoon reminder to not empty your inbox at the expense of someone else's. I'm deep in my Massachusetts visit, becoming one of those people who can't look at a place without remembering what used to be there. My birthday is tomorrow, so there are all sorts of opportunities for reflecting and remembering. Oh and I guess it's a holiday weekend in the US, so maybe schedule those emails for Tuesday. Image credit: Library of Congress, on Flickr Commons flickr.com
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28 August
Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.
Friday afternoon reminder to not empty your inbox at the expense of someone else's. I'm out of town helping my sister after she recovers from a medical procedure (she's doing well!). I'm out of my routine and pretty well out of my inbox and DEFINITELY out of it after 5 pm. Be mindful about what you ask for from other people, but just do your best. Have a restful weekend. Image credit: National Library of Medicine, on Flickr Commons flickr.com
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5 August
Organizational psychologist and professor at the Wharton School. Author of Give and Take, Originals, Think Again and Hidden Potential, host of the Re:Thinking podcast, and writer of the GRANTED newsletter.
Using social media in middle school predicts lower standardized test scores in high school. 10th graders who started social media before 9th grade are ~6 months behind their peers on math & reading. They're more distracted by their phones. No child should have access to social media. Related
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'm very excited to have been invited to Gloucester History Festival on the 20th September - and I hope to see you there! https://t.co/9kwJ2iJTr8 @GlosHistFest Related
3 August
Professor of atmospheric sciences at Texas A&M; writes The Climate Brink with Zeke Hausfather.
9 July
Climate scientist and energy systems analyst; writes The Climate Brink with Andrew Dessler and leads climate research at Stripe.
Statistician at Carnegie Mellon; writes on complex systems, machine learning and inference, and has kept a books-read notebook since 2000 that is now thousands of entries long.
Their words
The chapter on medieval Islam wasn't very deep, otherwise this is truly excellent, particularly when covering the very complicated 20th century. I don't have much more to say, because it is so good, except that I should try to get my brother to review it.
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bactra.org
15 June
Guardian columnist and environmental campaigner; wrote Feral and Regenesis, and argues for rewilding and against the food system as it is.
Reality Be Damned The policies of both Reform UK and the Conservatives would destroy a million jobs. In return, they offer imaginary employment in a fantasy industry. By George Monbiot, published in the Guardian 10th June 2026 Really? Yo…
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7 June
Robert Gray Dodge Professor of Network Science at Northeastern University; discovered scale-free networks and, with Reka Albert, proposed the Barabasi-Albert model.
Honored to receive the Euler Award, the @netscisociety's highest recognition. It was particularly meaningful to receive at the 20th anniversary meeting of the @netscisociety surrounded by the students, postdocs, collaborators who made this possible. Let us continue the journey! Related
25 May
Guardian columnist and environmental campaigner; wrote Feral and Regenesis, and argues for rewilding and against the food system as it is.
12 May
Managing partner at Ritholtz Wealth Management. Writes the blog The Irrelevant Investor and co-hosts the Animal Spirits podcast with Ben Carlson.
Micron just went on an all-time heater. Today at the open, Micron was the 10th largest stock in the S&P 500. Over the last five years, the average rank was 89. It ran from 127 last April to 10 today. Chart by @mattcerminaro Related
11 April
FreeBSD developer and former FreeBSD Security Officer; founder of the Tarsnap online backup service and author of the scrypt key derivation function.
14 March
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.
Happy Pi Day! In a certain sense, π is not a constant, but a variable. Using our usual Euclidean distance, it is 3.14159… but applying other L^p norms on ℝ², half the unit circle's perimeter will give other values. For instance, at p=1 (taxicab geometry), “π” = 2√2. At p ≈ 2.2, it's 3.20. Anyway, the video I was hoping to have out this day will be out closer to the 20th. Some call it “missing your deadline”, but I prefer to think of it as giving the L_{2.2} norm a little love. Related
13 February
Guardian columnist and environmental campaigner; wrote Feral and Regenesis, and argues for rewilding and against the food system as it is.
29 January
Writer and academic, author of The Cult of Smart and How Elites Ate the Social Justice Movement; writes a daily newsletter on politics, education and culture.
28 December 2025
Novelist, author of twelve books including Foundry, Bandwidth and Cumulus. Sends a newsletter of monthly book recommendations.
Their words
Trust by Hernan Diaz is an onion of a novel in which every chapter peels back a layer to reveal yet more beneath. Following the meteoric rise of a Wall Street financier in the early 20th century, the intricately plotted story will seduce you, transport you, stimulate you, mislead you, and, ultimately, move you.
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eliotpeper.substack.com
22 December 2025
Economist at George Mason University, co-author of Marginal Revolution, host of Conversations with Tyler. Writes in short, dense claims about economics, culture and AI, and has moved position on AI in public more than once.
Their words
A very good and readable book on this interaction, with excellent discussions of Donna Summer, Stevie Wonder, La Monte Young, and Penderecki, among many others.
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marginalrevolution.com
31 October 2025
Co-founder of Rockstar Games, lead writer of the Grand Theft Auto and Red Dead Redemption series, and founder of Absurd Ventures since leaving in 2020.
Their words
And I thought that section’s incredible because you realize in some ways, in all of its horrors, the most disappointing thing about the 20th century, in some ways, was the absolute failure of communism.
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youtube.com
21 September 2025
Co-founder of Sundial; former vice president of product design at Facebook; author of The Making of a Manager; writes The Looking Glass.
Their words
but if I was, you know, at the zero or 10th percentile, it can certainly get me even today very quickly up to like the 60th 70th in terms of um what the state of the art is.
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youtube.com
18 April 2025
Author of The Simple Path to Wealth and of the jlcollinsnh.com stock series on index-fund investing.
A New Edition of The Simple Path to Wealth Let’s start with a couple pieces of exciting news, and then I’ll fill you in. First, there is a brand new edition of The Simple Path to Wealth coming to bookstores on May 20th. Second, my pal Pete Adeney, Mr. Money Must…
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17 March 2025
Machine learning engineer working on recommender systems, personalization and information retrieval. Previously worked on LLMs and LLM infrastructure at Mozilla.ai and on ML and recsys at Duo, Tumblr, Automattic and Comcast; wrote the 'What are embeddings?' text and ran the Normconf conference.
20 years of YC I saw recently that YCombinator celebrated its 20th anniversary. Hacker News is slightly younger, but to me the two go hand in hand. As far as I can tell, I actively started reading Hacker News around 2011. I don’…
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21 January 2025
Development economist; writes Global Developments, on growth, history and the numbers behind them.
Their words
Catch-up growth in the 20th century was almost entirely state-led.
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global-developments.org
19 January 2025
Historian at Stanford and the Hoover Institution; wrote Milton Friedman: The Last Conservative and Goddess of the Market, on Ayn Rand.
Their words
It seems we're driven much more quickly by moods rather than thought-through ideas. Right now, it seems the ideas they follow the political mood and try to put together the underpinning of it where it really was the opposite for much of the 20th century.
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youtube.com
19 June 2024
Co-founder and CEO of Perplexity, an AI answer engine; previously a research scientist at OpenAI and a PhD student at UC Berkeley.
LLMs Google
Their words
In Google, even though we call it 10 blue links, you get annoyed if you don’t even have the right link in the first three or four. The eye is so tuned to getting it right. LLMs are fine. You get the right link maybe in the 10th or ninth. You feed it in the model. It can still know that that was more relevant than the first.
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youtube.com
4 March 2024
Historian of Ukraine at Harvard; wrote The Gates of Europe, Chernobyl and The Russo-Ukrainian War.
Their words
But the biggest global thing that happened was redrawing the map of the world and producing dozens, if not hundreds, of new states. That’s the outcome of the different processes of the 20th century.
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youtube.com
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