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Epidemiologist; founded Your Local Epidemiologist in March 2020 to translate public-health science, and consults for organisations including the CDC.

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  Reclassifying a vaccine out of official routine-recommendation status erodes practical access to it even without changing the recommendation itself.

  Their words

  Moving a vaccine out of that category adds significant implementation barriers that will erode access to vaccines.

  yourlocalepidemiologist.substack.com

Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.

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  C++23's std::flat_map is a better choice than std::map for many practical use cases.

  Their words

  In many practical cases, the new std::flat_map is a better alternative to the std::map.

  How fast is C++23’s std::flat_map?lemire.me

Clinical psychologist, EMDR consultant and yoga teacher in Boulder, Colorado. Author of The Complex PTSD Workbook and EMDR Therapy and Somatic Psychology; writes on trauma, attachment and the nervous system.

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  Innovations in Psychotherapy Conference

  Their words

  Honored to be speaking at the 2026 Innovations in Psychotherapy Conference (Nov 10–13 in Anaheim & Online)! Join us for evidence-based education & practical strategies to enhance your practice. Use code SPEAK26 to save $50:

  x.com

Professor of international affairs at Johns Hopkins SAIS and co-author, with Abraham Newman, of Underground Empire: How America Weaponized the World Economy.

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  AI labs fund social science partly to manage the fact that the AI buildout is unpopular, seeking ways to make it more acceptable to the public.

  Their words

  I suspect that some of the labs' willingness to put money into the social sciences stems from the realization of senior people that the practical build out of AI is highly unpopular in the U.S and their urgent desire to figure out how to sugarcoat the pill so that it will get swallowed

  How should social science think about AI?programmablemutter.com

Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.

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  Astra's mundane alignment is greatly superior to Sol's, but its superalignment status is deeply frightening.

  AI alignment

  Their words

  Astra’s mundane alignment is greatly superior to Sol. For practical purposes, I was actively nervous about some potential uses of Sol, in a way I am not for Astra. Astra’s super alignment status should scare the living daylights out of you.

  thezvi.substack.com

Physician focused on longevity; wrote Outlive and hosts The Drive.

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  The right cardio prescription depends on whether time or fatigue is capping your training volume, not on a fixed ratio of zones.

  Their words

  This is what tells us how to train: as the practical constraint on volume changes, so too does the appropriate tool.

  A better way to think about Zone 2peterattiamd.com

Founded PSPDFKit in 2011 and ran it for a decade. Came back from a break to work on AI agents — the OpenClaw project, and OpenAI, joined in February 2026. Writes at steipete.me.

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  Users like security in the abstract and experience it as breakage: hardening the project made things slower, harder to update, and broke what people depended on.

  Their words

  Sure, they they like the abstract term of security, but in all practical terms, they updated. I broke something they depended on. I made things slower and I made things more difficult to update.

  Peter Steinberger: "Fun Is Velocity"youtube.com

Co-founded Neuralink and founded Science Corp, which is building a retinal implant; writes about neural interfaces and biology.

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  Consciousness is a practical problem rather than a philosophical one: given a brain-computer interface that could read and drive every neuron, we would work it out quickly.

  Their words

  Now, if we had a tech if we had a magical BCI that allowed me to see the instant state of every neuron in the brain and and drive them, I think we'd figure out consciousness pretty fast. I don't think I think this is a practical problem, not a philosophical problem.

  Max Hodak: Average Is Not Good Enoughyoutube.com

General partner at Andreessen Horowitz from 2013 to 2018 and CTO of Coinbase from 2018 to 2019; co-founder of Counsyl and Earn.com. Wrote The Network State (2022), free in full at thenetworkstate.com, and founded the Network School.

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  Before the internet, most Americans had no practical freedom of speech unless they owned or worked for a media corporation.

  America

  Their words

  the vast majority of Americans had no practical freedom of speech unless they owned a media corporation or were employed by one.

  The Network Statethenetworkstate.com

Programmer; wrote Extreme Programming Explained and Test-Driven Development, signed the Agile Manifesto, and writes Tidy First?.

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  TDD earns its keep only where work alternates rapidly between doing and learning; choosing it is a practical decision, never a moral one.

  Their words

  It's when you have this rapid alternation between I do a thing, I learn a thing, I do a thing, I learn a thing, I do a thing, I learn a thing. That's where TDD is really powerful. But it's not a moral decision. It's a practical decision.

  youtube.com

Co-founder of Superlogical, started in 2026 to build server-side terminal infrastructure; creator of Ghostty. Co-founded HashiCorp and created Vagrant and Terraform before that.

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  Zig

  Their words

  Zig is exceptional software: ambitious, practical, independent, and unusually serious about quality. Ghostty exists in large part because Zig made it possible for me to build the kind of software I wanted to build. This is why I support Zig.

  mitchellh.com

Polyglot who speaks twenty languages and co-founded LingQ; argues that comprehensible input, not study, is what does the work.

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  The practical instruction that follows from the research is simple and hard to do: listen and read a great deal.

  Their words

  The practical takeaway from SLA research is both simple and demanding: you need to listen and read a lot.

  What Is Second Language Acquisition?blog.thelinguist.com

Co-founder and CEO of Anthropic; previously VP of research at OpenAI.

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  Training a model on principles rather than a list of rules is not an ideology but an empirical finding: its behaviour is more consistent and covers edge cases.

  Their words

  it's it's kind of purely a practical and empirical thing that we've observed that by teaching the model principles, getting it to learn from principles, its behavior is more consistent, it's easier to cover edge cases, and the model is more likely to do what people want it to do.

  youtube.com

Software developer and entrepreneur; co-founder of Heroku, author of The Twelve-Factor App, and a researcher at Ink & Switch.

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  Open-source text embedding models run well enough on consumer hardware to be practical for real tasks.

  Their words

  Local / open text embedding models work fine on consumer hardware.

  Email triage with an embedding-based classifieradamwiggins.com

Executive coach for product leaders. Previously a partner at GV (Google Ventures) and a product manager at Google. Writes at Bring the Donuts, including a standing essential-reading list for product managers.

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  Product Management in Practice

  Their words

  Real-world, practical advice for PMs. Focused on communication, organization, research, and execution.

  bringthedonuts.com

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  High Output Management

  Their words

  This one only gets better with age. Although it’s only mentioned briefly, this is where Andy Grove first introduced OKRs to the world. His practical advice about meetings, especially the importance of 1-on-1s, inspired

  bringthedonuts.com

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  Scaling People: Tactics for Management and Company Building

  Their words

  Claire has been a senior executive at Google and Stripe. Here she offers up a guide to leadership that is both practical and inspiring. Suitable for leaders of all levels.

  bringthedonuts.com

Economist and Nobel laureate. Wrote a New York Times column for 25 years until December 2024 and now publishes several times a week on Substack.

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  Renewables now account for the bulk of the growth in electricity generation, whatever their opponents believe.

  energy

  Their words

  there are many people who still refuse to believe that renewables can be practical even as renewables keep growing around the world, in fact accounting for the bulk of growth in electricity generation

  The Rise of Renewable Energypaulkrugman.substack.com

Anthropologist; wrote Genghis Khan and the Making of the Modern World and The Secret History of the Mongol Queens.

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  Genghis Khan reached his laws through the practical experience of being hurt, never through ideology or the study of moral right.

  Their words

  I don't say that he did this because of some ideological reason. Just like he didn't outlaw the kidnapping of women for ideological reasons. He didn't come to it through studying ideas of moral right. He came to it through practical experience of life.

  youtube.com

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  Slow Boring

  Their words

  He takes a very proto-rationalist, practical approach to this, that I very much appreciate, complete with yearly predictions. The writing is consistently enjoyable and clear.

  thezvi.substack.com

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  Construction Physics

  Their words

  No one drills down into the practical, detail level in an accessible way as well as Brian Potter.

  thezvi.substack.com

Computer performance engineer working on datacenter performance at OpenAI, previously Netflix and Sun/Joyent. Author of Systems Performance and BPF Performance Tools, and creator of flame graphs.

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  The Practical Performance Analyst

  Their words

  The Practical Performance Analyst - Neil Gunther (McGraw Hill, 1997)

  brendangregg.com

Writer and former McKinsey/BCG strategy consultant; author of The Pathless Path and Good Work, about leaving the default career track. Publishes the Boundless newsletter and podcast.

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  The Art of Gig, Volume 1: Foundations

  Their words

  An unconventional guide to the craft of indie consulting and life in the gig economy, mixing philosophy, pattern language, and very practical guidance for building a client-based solo career.

  pathlesspath.com

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.

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  Working Effectively with Legacy Code

  Their words

  Legacy code has no test and is not written to be testable. Touching it this sphaghetti code somewhere breaks the system. And to refactor safely, we'd need to have tests first... but where to start? This book gives practical suggestions

  blog.pragmaticengineer.com

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  A Philosophy of Software Design

  Their words

  There are few books like this, that discuss software design in a simple and approachable way, while leaving the reader novel and practical concepts to use.

  blog.pragmaticengineer.com

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  The First 90 Days

  Their words

  When joining a new company, your perception is shaped massively in your first 3 months. It takes a lot of work to change that perception later. This book is a practical guide on how to be conscious in focusing on getting up to speed, faster. (My rating: ★★★★★)

  blog.pragmaticengineer.com

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  Designing Data-Intensive Applications

  Their words

  The most practical book I've found so far on distributed systems.

  blog.pragmaticengineer.com

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

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  Almost every one-to-one Telegram chat, and every group chat, is readable on Telegram’s own servers.

  Their words

  The practical impact is that the vast majority of one-on-one Telegram conversations — and literally every single group chat — are probably visible on Telegram’s servers, which can see and record the content of all messages sent between users.

  Is Telegram really an encrypted messaging app?blog.cryptographyengineering.com

Partner at Collaborative Fund and author of The Psychology of Money, Same As Ever and The Art of Spending Money. Writes essays on investor behavior and posts frequently on X.

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  Debt is best understood as narrowing the range of outcomes you can survive, not as a cost of capital.

  Their words

  I think this is the most practical way to think about debt: As debt increases, you narrow the range of outcomes you can endure in life.

  How I Think About Debtcollabfund.com

Research scientist at Meta in Berlin working on multilingual models and evaluation; led the multilingual team at Cohere and was a research scientist at Google DeepMind before that.

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  Retrieval-augmented generation is the most practical approach for reducing LLM hallucinations.

  LLMs

  Their words

  Retrieval-augmented generation (RAG; Lewis et al., 2020), which conditions on the LLM's generation on retrieved documents is the most practical paradigm IMO.

  Command R+ruder.io

Co-founder and CEO of OpenAI; previously president of Y Combinator.

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  The board of a nonprofit answers to no one but itself, and the board governing the road to AGI ought instead to answer to the world as a whole.

  AGIOpenAI

  Their words

  In this case, and I think one of the things with our structure that we maybe should have thought about more than we did is that the board of a nonprofit has, unless you put other rules in place, quite a lot of power. They don’t really answer to anyone but themselves. And there’s ways in which that’s good, but what we’d really like is for the board of OpenAI to answer to the world as a whole, as much as that’s a practical thing.

  youtube.com

Writer on learning and skill acquisition; author of Ultralearning and Get Better at Anything, known for the MIT Challenge and the Year Without English.

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  Cognitive Behavior Therapy

  Their words

  I recently reviewed Beck's book, which is written as a practical guide for therapists implementing CBT.

  scotthyoung.com

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.

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  Unshackled: A Practical Guide For Highly-Skilled Immigrants To Thrive In The United States

  Their words

  breaks down how legal immigration works in America in a way that is friendly, accessible, and human

  feld.com

Family therapist and founder of Relational Life Therapy. Author of I Don't Want to Talk About It, How Can I Get Through to You? and Us; argues that Western individualism is what makes couples' work hard.

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  The New Rules of Marriage: What You Need to Know to Make Love Work

  Their words

  Terry shares five non-starters to avoid and practical strategies for bringing honesty, passion, and joy back to even the most difficult relationship.

  terryreal.com

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  Template Metaprogramming with C++

  Their words

  I spent the last few weeks reading Template Metaprogramming with C++ by Marius Băncilă. It is currently 50$ on Amazon. Though, technically, the book is about advanced 'template' techniques, it is much more broad and practical. It is one of the 'good programming books'. If you are an experienced C++ programmer, you should give it a peek

  lemire.me

Developer and podcaster; created Instapaper and Overcast, co-founded Tumblr, and co-hosts the Accidental Tech Podcast.

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  People often use a dominant app not because it's good, but because it's the only practical way to reach an important goal in their life.

  Their words

  Most people use a Facebook-owned app not because it's a good app, but because it's a means to an important end in their life.

  The future of the App Storemarco.org

Psychotherapist who trained with Jeffrey Young from 1989 and founded The Cognitive Therapy Center of New Jersey and the Schema Therapy Institutes of NJ-NYC-DC. Wrote Disarming the Narcissist.

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  Disarming the Narcissist

  Their words

  Now a self-help classic, Disarming the Narcissist is a practical, step-by-step communication guide to help you cope with and confront the narcissist in your life.

  disarmingthenarcissist.com

Founder and CEO of Get Lighthouse, a management-coaching software company, and previously a product lead at KISSmetrics. Writes about leadership, management and product at jasonevanish.com.

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  Obviously Awesome

  Their words

  Simple, practical, useful. This book is a quick read that covers modern positioning and how to do it. Unlike all the theoretical books out there, this is a VC who lived a life as a marketer (all the way up to CMO/VP) doing this and then worked with more entrepreneurs. This hands on experience leads to a system that is easy to understand and apply. I'm now trying to apply it so this score will rise or fall based on the results we have.

  jasonevanish.com

Creator and editor of BladeReviews.com, a pocket knife and EDC tool review site he founded in 2010 and wrote single-handedly for its first five years.

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  Victorinox Hunter Pro Alox

  Their words

  The problem is the knife is way too heavy. Maybe if they ditched the liners, thinned the blade, and re-worked the steel backstrap you would have something that could cross-over between outdoor use and Urban EDC without pulling your pants off. As it stands the Pro Hunter strikes me as an oddity in my collection. Large and heavy, which makes it less practical. I hope it won't stop Victorinox from attempting to innovate, but it doesn't entirely feel like a step forward for the brand.

  bladereviews.com

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.

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  The Art Of Probability

  Their words

  Hamming was a practitioner, spending much of his career in Bell Labs, so unlike many books on probability, this stays grounded in the kind of intuitions that come up a lot in solving practical problems. It has countless helpful puzzles and problem-solving tricks which are organized in such a way as to give a sense of the deeper theory underlying probability and statistics.

  3blue1brown.com