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Adam DeHaven
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Some photos from our trip to Spain + Portugal
portugal spain trip
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20 September
Software engineer and educator; creator of Testing Library and of the EpicWeb.dev and EpicReact.dev courses.
Scott the Sloth is one of my Grok bots and it gets an email thanks to @kodykoala. Scott has managed the entire trip using Kody connections to access my calendar and email. I did not have time in my schedule for this so Scott drafted a reply for this for me. Related
19 September
Dutch bootstrapper who builds and runs their internet startups alone — Nomads.com, Remote OK, Hoodmaps, Photo AI and Interior AI — and has written about it at levels.io since 2013. Posts as @levelsio.
🌎 Now redesigning the https://t.co/HGCLKS5BD6 profile trips globe from scratch I've always wanted to add space trips, so starting with the moon here which you can add as a future trip, also adding Mars etc. Other trips also need to work here though like going into orbit like @satofishi did on @SpaceX's Dragon capsule which will be more in reach for more people hopefully pretty soon! Quoting @levelsio ✨ Finally built a timeline for https://t.co/HGCLKS5BD6 now I always wanted to make my site a bit more social, because I had profiles and trip overlaps and you could kinda see where other people went, but not something like this So on this new page you can see people near you, where everyone's trave… Related
✨ Finally built a timeline for https://t.co/HGCLKS5BD6 now I always wanted to make my site a bit more social, because I had profiles and trip overlaps and you could kinda see where other people went, but not something like this So on this new page you can see people near you, where everyone's traveling too, etc. There's the [ For you ] tab and [ Following ], like on X. So you can see people you follow, or just everyone I hope I can improve it more so the site will result in more serendipitous connections, especially now that's it's free Also nice you can see where people will be in the future… Quoting @levelsio 🌎 https://t.co/1z6UN2d0nh globe is now ready for space travel too 😊 Related
18 September
Co-founder of AngelList. Writes and podcasts at nav.al in short, aphoristic pieces on startups, wealth and judgement rather than long essays.
Their words
Effective Altruism lets you appear rational and moral - the ultimate ego trip.
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@naval on X x.com
16 September
Geneticist and writer on human population genetics, deep history and evolution; author of the Unsupervised Learning newsletter.
was great seeing friends in new york on a business trip! Related
Economic historian at Columbia; writes Chartbook on economics, geopolitics and history, and wrote Crashed and The Deluge.
15 September
Technical educator, conference speaker and developer relations engineer based in Ottawa, Canada. Author of the Anubis bot filter and of over 400 articles at xeiaso.net.
Their words
Filesystem reads in that case are 10 nanoseconds at most (the filesystem cache helps so much here) but doing any network roundtrip is 10 milliseconds at minimum. It's at least a million times slower because of how reality works.
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tigrisdata.com
14 September
Author of The 4-Hour Workweek and Tools of Titans, and host of The Tim Ferriss Show podcast.
Few of us consider ourselves philosophers. “Philosophy” usually conjures images of dense textbooks and academic quibbling with no application to real life. It’s fun for professors, perhaps, but a waste of time for the rest of us. I felt this way for decades. Then, in 2004, I found the work of Lucius Annaeus Seneca, better known as Seneca the Younger or simply “Seneca.” Born circa 4 BC in present day Spain and raised in Rome, Seneca was simultaneously an esteemed playwright, one of the wealthiest people in Rome, a famous statesman, and an advisor to the emperor. He had to negotiate, persuade,… Related
Writer of Today in Tabs, a daily media-and-internet newsletter started in 2013; earlier founded the community site Kuro5hin.
I told my wife I have to keep adding oil to our truck on this road trip so she asked how much I’ve added and I said I don’t know, it’s a quart low every time I check so she said it sounds like we’re just feeding oil to the trans-Canada highway and then my mechanic started crying Related
13 September
Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.
A couple of photos of Paddington Station from my trip to the UK. Every train station has its own unique vibe and I love them all. #photography #trains Related
11 September
Philosophy professor at UC Berkeley and creator of pandoc, the universal document converter, and of the CommonMark markdown specification.
8 September
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 30.1: Overflow Want to see how VCs talk in a private chat? How it works when you've got crypto in the mix? Oh, and how confidential information gets leaked to reporters... "You are going to trade on a phone call Trip did not understand." zeroknowledge.ink
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7 September
Economics professor at the University of California, Berkeley and a former Deputy Assistant Secretary of the US Treasury. Author of Slouching Towards Utopia and writer of the Grasping Reality newsletter.
A pump-and-dump dressed up as a fake cabinet post?: Elon Musk’s DOGE took money Congress had lawfully appropriated to fight disease and grow the world economy, and simply nixed it. The crypto coin that Musk was then not so quietly promoting made a round-trip: the DogeCoin chart runs $0.09 to $0.40 and back to $0.09. But the 800,000 or so who would be alive today without DOGE’s illegal and unconstitutional chaos-monkey wrecking ball did not come back: **Elon Musk & His DOGE & DogeCoin... 1/ crypto Related
6 September
Web developer and writer; an early GitHub employee, author of speaking.io and of widely read essays on startups and product.
Apologies if you’ve sent in a pitch deck for your startup this week; I’ve gotten 150+ pitches the last few days and that’ll take me a bit to dig through. Angel investing is a real trip. startups Related
4 September
Economic historian at Columbia; writes Chartbook on economics, geopolitics and history, and wrote Crashed and The Deluge.
3 September
Dutch bootstrapper who builds and runs their internet startups alone — Nomads.com, Remote OK, Hoodmaps, Photo AI and Interior AI — and has written about it at levels.io since 2013. Posts as @levelsio.
From one piece
Portugal could have been the Silicon Valley of Europe
2 beliefs · levels.io
Europe
Their words
Portugal's choice is cultural though and completely fits the general spirit in Europe which is fully anti-tech, anti-AI, anti-entrepreneurship, anti-business and anti-progress
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levels.io
Their words
Portugal collectively decided they wanted to remain relatively poor and technologically and intellectually behind
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levels.io
1 September
Writes Pedestrian Observations on public transit and why infrastructure costs what it does; a pure mathematician by training, comparing how different countries build.
30 August
Belgian engineering lead, Microsoft MVP and public speaker. Creator of Front Matter, a headless CMS extension for Visual Studio Code.
New in Worklog: Lists. Some checklists you run over and over: a packing list, a release run, the monthly invoicing routine. Tick through it, press Start again, and it is waiting unticked for next time. Can you spot that I'm planning my cycling trip? Related
24 August
Security researcher; built Report URI and Security Headers, and writes about web security in practice.
18 August
Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.
Spent an afternoon at Highgate Cemetery when on vacation in the UK and this is one of my favorite photos from the trip. #photography #cemetery #victorian Related
12 August
Interactive fiction author and hacker; wrote Spider and Web and Hadean Lands, and designed the Glulx virtual machine.
I absolutely intend to get to AdvX someday. Until then, you should go. (I actually had a UK trip line up once. I got to the place where AdvX was, but I hadn't pre-registered so I failed to get in. Oh well.) Quoting @adventurex.bsky.social Tickets for #AdvX26 are now on sale! Event page: buytickets.at/adventurexconferencescic/2339289 More info: adventurexpo.org/faq AdventureX brings together narrative gaming pros and enthusiasts, this year taking place in London on 7-8 November at the LSBU Hub building. Let us know you're joining! Related
6 August
Front-end developer and writer; co-founder of CodePen, founder of CSS-Tricks, and co-host of the ShopTalk Show podcast.
Outburst Just had a little trip up to my favorite city of Juneau, Alaska. So lovely. Here's just one story from the trip.... chriscoyier.net
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31 July
Ancient and military historian; writes A Collection of Unmitigated Pedantry, long series checking what history actually says against how popular culture tells it.
Fireside Friday, July 31, 2026 (On The Odyssey) Hey folks, Fireside this week, as I am fresh back from a short family trip before the jaws of the Fall semester close upon me. I did get a chance to see Christopher Nolan’s The Odyssey and I wrote a review of it for For…
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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.
Their words
That's a hell of a lot slower than knowing it in cognitive L1 cache. And you can have way more round trips in your brain than you can, you know, muttering through, you know, super whisper or typing it out or whatever.
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youtube.com
25 July
Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.
Memory-level parallelism: AMD is the king When your program asks for memory that is not in cache, the processor has to go to RAM. That trip costs on the order of 100 nanoseconds. On a 3 GHz core, that is about 300 cycles of doing nothing. Memory latency has not…
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24 July
Writer and former Substack product manager; publishes essays and interviews on technology, culture and China at jasmi.news.
data center road trip // day 6-7 I don't think the data center backlash is about AI being evil or risky — but it does reflect people finding AI uniquely useless for example: is the data center backlash just like the backlash to solar farms? @nicholas_bagley observed that both movements use classic NIMBY playbooks: Facebook groups, FOIA requests, packing city council. both also involve land use tensions between rural towns and state directives. yet the Saline, MI activists I met were pro-solar farms and anti-data center. first, data center deals are more secretive with more NDAs and bigger $$… Quoting @jasminewsun I’m spending the next week driving around Wisconsin and Michigan to get a firsthand view of the data center buildout and backlash am visiting sites, talking to tons of people — tradespeople, activists, planners, residents — then writing up a story lmk what questions I should dig into! solar data centers Related
21 July
Full-stack developer, creator of Tailwind CSS; writes at adamwathan.me and makes courses and screencasts for web developers.
Solo trip to @ShopifyDevs DotDev for the day, say hi if you see me 👋 Related
Writer and former Substack product manager; publishes essays and interviews on technology, culture and China at jasmi.news.
data center road trip // day 4-5 the AI backlash is bipartisan & showing up in politics in a big way - Abdul El-Sayed brought Bernie and AOC to rally with him in Lansing. all 3 decried AI oligarchy (Bernie with the longest spiel) - in WI, DSA member Francesca Hong is leading the Dem governor’s primary. she hopes to win rural conservatives as the only candidate backing a data center moratorium - a canvasser for Will Lawrence in MI7 told me that 90% of the doors she knocked on Saturday named data centers as a top issue these are purple battleground states, yet pollsters are finding Dems and Rep… Quoting @jasminewsun I’m spending the next week driving around Wisconsin and Michigan to get a firsthand view of the data center buildout and backlash am visiting sites, talking to tons of people — tradespeople, activists, planners, residents — then writing up a story lmk what questions I should dig into! data centers Related
17 July
Writer and former Substack product manager; publishes essays and interviews on technology, culture and China at jasmi.news.
16 July
American senior staff engineer working on developer and user experience and open source; writes at adamdehaven.com.
@re_baar if you stay on your world tour a bit longer your favorite @traci_dehaven will be in Spain + Portugal next month Related
15 July
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.
3 July
Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.
Another picture from my camping trip. Hard to believe this eerie wonderland is only a couple hours from home. Related
30 June
Writes Pedestrian Observations on public transit and why infrastructure costs what it does; a pure mathematician by training, comparing how different countries build.
7 June
Game designer and programmer, co-founder of id Software and co-creator of Doom, Quake and Wolfenstein 3D. Now runs Romero Games in Galway, Ireland.
This weekend in Zamora, Spain at the @CylGamesShow. Related
6 May
American budget-travel writer who publishes as Nomadic Matt. Author of How to Travel the World on $50 a Day; runs nomadicmatt.com, a long-running site of destination guides, packing advice and gear recommendations.
24 April
Software architect and futurist; founded ClariNet, chaired the EFF, and has written about robocars for two decades.
17 April
Writer, photographer and software maker based in Japan; publishes long-form essays, walking newsletters and self-made books at craigmod.com.
26 March
American budget-travel writer who publishes as Nomadic Matt. Author of How to Travel the World on $50 a Day; runs nomadicmatt.com, a long-running site of destination guides, packing advice and gear recommendations.
20 March
Freelance climate and energy analyst in Oslo, writing on Europe, the US and Australia; worked in the Australian renewables industry before that.
10 March
Writes Pedestrian Observations on public transit and why infrastructure costs what it does; a pure mathematician by training, comparing how different countries build.
16 February
American budget-travel writer who publishes as Nomadic Matt. Author of How to Travel the World on $50 a Day; runs nomadicmatt.com, a long-running site of destination guides, packing advice and gear recommendations.
21 January
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.
10 October 2025
American backpacking guide, writer and endurance athlete who has hiked more than 30,000 miles; author of The Ultimate Hiker's Gear Guide and publisher of gear reviews and trip-planning tutorials at andrewskurka.com.
114 testimonials from our 2025 season For twelve seasons I’ve asked our clients to complete a post-trip survey to gather feedback about our guides, locations, meals, and curriculum, plus their overall satisfaction. Reviewing the results is a time commitment…
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5 October 2025
American senior staff engineer working on developer and user experience and open source; writes at adamdehaven.com.
Nothing as humbling as using the gym at a hotel in Europe and converting pounds to kilograms 😅 Doesn’t help I’ve been traveling for almost 4 weeks straight Budapest // Colorado // Spain Europe Related
1 October 2025
Independent game developer, creator of the colony simulation RimWorld and author of Designing Games: A Guide to Engineering Experiences. Previously worked on BioShock Infinite.
I had a great trip to the @Krafton_inc Developer Conference to do the keynote. Everyone was welcoming and questions were high level. Thanks guys. Related
29 August 2025
American senior staff engineer working on developer and user experience and open source; writes at adamdehaven.com.
Check out the video from my talk at MadVue 2025 in Madrid, Spain on Powering Multi-Tenant Applications with @nuxt.com, and learn how we leveraged the framework to help build Kong‘s new Developer Portal youtu.be
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13 August 2025
Cyborg anthropologist and UX designer; author of Calm Technology and co-founder of the geolocation startup Geoloqi.
Picture yourself checking into a hotel during a work trip. You’re groggy after a long day, but there's a dumb new interface to learn. caseorganic.medium.com
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5 August 2025
China economy researcher based in Beijing who writes on his personal blog about Chinese political economy, history, books and music.
31 July 2025
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
Mind candy: A fun travelogue which does what it says in the title. It pretty much satisfies any impulses I might have to actually see any of the artworks in question. No familiarity with art-critical jargon required, though long passages are (more or less explicitly) art criticism.
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bactra.org
28 July 2025
China economy researcher based in Beijing who writes on his personal blog about Chinese political economy, history, books and music.
5 June 2025
Chief executive of Alphabet and Google; joined Google in 2004 and led Chrome and Android before taking over in 2015.
Their words
I feel like we are in the AJI phase where dramatic progress, some things don't work well, but overall you're seeing lots of progress.
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youtube.com
19 May 2025
Founder of what became Bloomberg New Energy Finance; writes and speaks on clean energy, hydrogen and the economics of the transition, and hosts the Cleaning Up podcast.
31 December 2024
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.
Their words
Cathedral of the Sea by Ildefonso Falcones - One of the biggest recent creative impacts of my life was a trip I took to Barcelona in 2023.
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vickiboykis.com
7 December 2024
Writes Pedestrian Observations on public transit and why infrastructure costs what it does; a pure mathematician by training, comparing how different countries build.
30 September 2024
Archaeologist of the Maya and the ancient Americas; directs the Maya Exploration Center and presents the ArchaeoEd podcast.
America
Their words
I think that the Spanish and the Portuguese get unfairly maligned in what’s been called the Black Legend, that they just marched into America and murdered everyone. That’s not the fact. It was the diseases that murdered everyone.
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youtube.com
26 June 2024
Coffee consultant and author of books on espresso, roasting and brewing, including The Professional Barista's Handbook and The Coffee Roaster's Companion; writes about brewing gear and roast control at scottrao.com.
Viva Colombia I recently spent twelve days in Colombia. It was an unforgettable trip, full of learning, beautiful scenery, wonderful hospitality and new friends. I’d like to share a bit of my experience with you. I visi…
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28 April 2024
Writer and consultant on technology, organizations and history; founded the blog Ribbonfarm and now writes the Contraptions newsletter.
Revisited old favorite topics from like 1996-2003 in light of Daniel Dennett’s passing. It’s been 2 decades since I last dabbled seriously in these matters, but fun nostalgia trip to old intellectual stomping grounds open.substack.com
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26 December 2023
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.
Their words
The Outlaws by Javier Cercas - This book, translated from Spanish, covers the years of Spain after the Franco dictatorship but only obliquely hints at them.
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vickiboykis.com
29 November 2023
Development economist; argues that letting people move to rich countries does more for the poor than aid, and wrote Let Their People Come.
From one piece
Lant Pritchett, economist: ‘Negativity around migration is the last breath of a moribund system’
2 beliefs, in the piece's order there
immigration
Their words
Governments should create three tracks for people who come to live in their country. One track is that of people who hope to become Spanish. Another is that of those who we are going to allow to live and work here; the third is that of those of we are going to allow to be in Spain out of necessity.
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english.elpais.com
immigration
Their words
In the absence of immigrants, between 2020 and 2050 Spain’s labor force (its active population) will drop from 22.6 to 15.7 million people. You’re not going to fill all the jobs needed in a modern and sophisticated economy like that of Spain’s with 15.7 million people.
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english.elpais.com
28 October 2020
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.
Their words
If you like simple books like "ReWork", this is the sales book for you. Fox has a simple, direct way of sharing advice on how he sees the best sales people operate. Nothing here is Earth-shattering, but if you zoom out, you realize that the little details, the simple things are what trip a lot of people up in sales (myself included). If you want to tighten up your sales game, or just get some fundamentals right, this is a good, quick read.
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jasonevanish.com
26 July 2019
Development economist; writes Global Developments, on growth, history and the numbers behind them.
The RA’s Guide to Busia Spending a summer doing fieldwork in Busia, Kenya has become a rite of passage for Berkeley development RAs. When I was planning my trip, I wish there’d been a guide with the collected experience of former RAs all in on…
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A korrent is a belief a person has stated in their own words: one
sentence stating the claim, backed by a quote and a source, kept at
korrents.com .
Under a name here, the quoted block is what they actually said.
The korrent beneath it is the claim those words support, in
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else holds it.
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About the English under a post
Some people here publish in a language other than English. Where they
do, this site shows a machine translation beneath the post, in
this typeface — the site's own, not theirs.
The post itself is never changed, moved or hidden: what is set in the
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article and a belief on korrents.com
are left in their original language.
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