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Writer and teacher on productivity and personal knowledge management. Author of Building a Second Brain and founder of Forte Labs, which runs the course of the same name.

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  Educational methods should be validated by measurable research, not by how satisfying they feel to students and teachers.

  Their words

  The deeper lesson is that education has to be research-based and proven to work measurably, not just based on positive emotions or customer satisfaction.

  fortelabs.com

Founded Bridgewater Associates in 1975 and led it until stepping back from control in 2022. Author of Principles, The Changing World Order and How Countries Go Broke; publishes economic analysis at economicprinciples.org.

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  A government debt crisis is measurable and therefore visible well in advance; the diagnostic is mechanical rather than a matter of judgement.

  government

  Their words

  Because one can measure these things, one can monitor this debt dynamic happening, so it’s easy to see problems approaching. I’ve used this diagnostic process in my investing and I’ve kept it to myself, but I’m now explaining it in detail in How Countries Go Broke: The Big Cycle because it is too important to keep to myself.

  raydalio.substack.com

Demographer; writes on fertility, marriage and population, and directs the Pro-Family Initiative at the Institute for Family Studies.

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  Ruling out every measurable cause because none explains all the variation, and putting an unmeasured one in their place, is not an explanation.

  Their words

  He ruled out all the actual, measurable variables because they were an imperfect explanation, and instead offers a vague, diffuse variable, for which he has no measure, and which is not actually included in his model.

  We Actually Know A Lot About Fertility Declinelymanstone.substack.com

Engineering leader on Google Chrome; writes about web performance and, lately, about working with AI coding tools.

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  "Is the page loaded?" was never a real question, and web performance only became measurable once it was broken into the distinct moments a user actually notices.

  Their words

  I think for a very long time we had this this almost nebulous way of thinking about page load times. And the team felt like it was finally time to come up with a more nuanced perspective around how we reason about performance.

  youtube.com

Bren Professor of Psychology, Neuroscience and Biology at Caltech, where he studies the neuroscience of emotion and social cognition.

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  Switching between tasks carries a real and measurable cost, and switching well is a trainable skill rather than a fixed property of a brain.

  Their words

  So, as soon as you switch into something, there's a cost carried over from the previous task, and you're much slower and more difficult for the couple of next trials on the new task. So, there's always a switching cost

  youtube.com

Cardiologist and founder of the Scripps Research Translational Institute; writes Ground Truths on biomedical research, and wrote Super Agers and Deep Medicine.

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  Measurable, modifiable biological age at the organ and cell level is the most important advance yet in the science of human ageing.

  Their words

  I believe this represents the most important advance we have yet seen in the science of human aging.

  Medicine is Moving From Calendars to Clockserictopol.substack.com

Builds developer tools — SST, and now OpenCode at Anomaly. Posts constantly on x.com and writes almost never; the blog stopped in 2021.

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  The verbose enterprise patterns everyone hated are worth having again: coding agents are idiots working around the clock, and you are not the one typing the boilerplate any more.

  coding agents

  Their words

  We're now doing it in a much heavier way because we find that these like kind of bory enterprisey uh patterns end up being pretty useful because you have a bunch of idiots on your team now. The coding agents are a bunch of idiots and they are going to work 24/7 and they're going to like ship a lot of stuff. So you need way more guardrails than you used to.

  Building OpenCode with Dax Raadyoutube.com

Geneticist at Harvard; reads ancient DNA to work out how populations moved and mixed, and wrote Who We Are and How We Got Here.

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  Population size is not what limited human adaptation; time is. A selection coefficient of half a percent works as well in a thousand people as in a million.

  Their words

  So we're talking about strong measurable selection coefficients on the order of half a percent or more in this study and all of those are going to work in small populations or large populations. It's not going to be affected by the population size.

  youtube.com

Austrian developer. Created the libGDX game framework, and more recently the pi coding agent, which moved with them to Earendil — Armin Ronacher's company — in April 2026. Writes at mariozechner.at.

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  Two people with agents can reach enterprise-grade codebase complexity in weeks -- what took organisations years, and they at least adapted to it as it grew.

  Their words

  And organizations have super high pain tolerance. But human-made enterprise codebases take years to get there. The organization slowly evolves along with the complexity in a demented kind of synergy and learns how to deal with it. With agents and a team of 2 humans, you can get to that complexity within weeks.

  Thoughts on slowing the fuck downmariozechner.at

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.

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  The best teachers, unlimited resources and every evidence-based intervention still fail on a student who does not want to learn.

  Their words

  You can staff a school with the best teachers on earth, give them unlimited resources, and wrap the place in every evidence-based intervention imaginable, and it still won’t work if students are resistant, disengaged, or actively hostile to the enterprise.

  freddiedeboer.substack.com

Assyriologist and curator at the British Museum; reads cuneiform, and wrote The Ark Before Noah and The First Ghosts.

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  A board game conquers the world when chance and strategy are in balance in it.

  Their words

  But it has built within it, is the way I understand the game plays, a measurable quota of strategy. It’s a mix of probability and strategy.

  youtube.com

Vice chairman of Ogilvy & Mather Group, the advertising agency; author of Alchemy (2019) and the Wiki Man columnist at The Spectator.

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  Pursuing efficiency pushes attention onto measurable factors and away from the psychological ones where the larger gains are available.

  Their words

  But when you pursue efficiency generally you start looking at numerical or mechanical factors and of course in the process you disregard psychological factors where the greater gains may be found and so you focus too heavily on cost reduction and too little on value creation.

  youtube.com

Founder of Telegram, and before it of VK.

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  Government is people with goals, so it grows by nature; there must be very strict limits on how far it can expand its power at the expense of citizens.

  government

  Their words

  That's how you end up in an endless loop of ever-increasing taxes, ever-increasing regulation, which ultimately suffocates free market, free enterprise, and free speech. So, you do want to have very, very strict limitations on the extent the government can increase its powers at the expense of citizens.

  youtube.com