Matt Keeter

@mattkeeter.com

3590 Followers 1508 Following

✨ Weird CAD and graphics research ⚙️ Embedded software and Rust 🌎 Cambridge, MA 🏠 mattkeeter.com

Cartoon of Calvin (from Calvin and Hobbes) lying sleepless in his bed, looking confused and concerned
Screenshot of a text message reading GEICO: Your verification code is: D1E666. It expires in 10 minutes. Please do not share this code with anyone or reply to this message.
Screenshot of a Reddit post in the /r/softwarearchitecture subreddit, with the title How do you guys test new features when you already have users and a production level application (vercel + supabase) submitted 1 day ago by Leather-Run-3282 The text reads as follows: I've been thinking about this a lot lately and I'm curious how other people are doing it. for context- I AM NEW TO THIS SO PLEASE DONT EAT ME OUT IN THE COMMENTS
Screenshot of a post by andrewrk reading "If you want to comment in this thread, please either have your open source zig project(s) visible on your codeberg profile, or be Fil Pizło, otherwise zig issue tracker is not interested in what you have to say" It has 10 thumbs-ups, 3 thumbs-downs, and 1 skeptical face
Three-panel meme of a man riding a bike, sticking a stick in the spokes of the front tire, then falling off and clutching his knee
Screenshot of an SEC filing reading Foreign currency risks and foreign exchange controls could adversely affect our financial results. Our results of operations, growth prospects and the value of our assets are affected by fluctuations in currency exchange rates, which have had, and may continue to have adverse effects on our reported earnings. More specifically, an increase in the value of the U.S. dollar, relative to other currencies, such as the Chinese Renminbi (“RMB”), Australian Dollar, the British Pound and the Euro, as well as currencies in certain other markets have historically affected and may continue to affect our reported earnings. Any significant fluctuation in the value of currencies of countries in which we or our Concepts’ franchisees operate, particularly the RMB in China, could materially impact the U.S. dollar value of royalty payments made to us, which could result in lower revenues, could lead to increased costs and lower profitability to us or our Concepts’ franchisees and/or could cause us or our Concepts’ franchisees to increase prices to customers, which could negatively impact sales in these markets and harm our financial results. In addition, the governments in certain countries where our Concepts operate, including China, restrict the conversion of local currency into foreign currencies and, in certain cases, the remittance of currency out of the country. Currency control restrictions on the conversion of other currencies to U.S. dollars or restrictions imposed by countries on cash remittances could cause royalty payments to us to be delayed, remitted only partially or not at all, which could cause us to incur bad debt expense and impact our liquidity. (from https://www.sec.gov/Archives/edgar/data/1041061/000104106126000084/yum-20251231.htm)
Screenshot of a child’s growth chart, showing 4th percentile weight, 35th percentile height, and 88th percentile head circumference
Picture of a pale red sun behind power lines; a tree and apartment building are also visible
Screenshot of a Claude reply reading Practically, "registering" your labeller's OAuth client is: pick a URL path in the same Rust binary you're already building, return a static JSON blob from it, and use that URL as client_id everywhere else. No API keys to request, no approval wait, no separate developer portal account to create — the публикация of the document is the registration.
Screenshot of Claude output reading I think what actually happened is that my fetch tool returned fabricated content rather than a real page — it produced something plausible-looking (README, production checklist, exit codes, CLI examples, all internally consistent) rather than reliably reporting a 404. That's on me to have caught rather than treated as ground truth, especially since I then repeated it back to you with specific technical claims as if I'd verified them.
Photograph of a four-way tiled intersection of hallways. The floor is half tiled, half concrete. Two EXIT signs point in opposite directions. There are signs on the wall for a variety of MBTA lines, plus a printed paper sign pointing in the direction of an elevator.
Picture of the ship attached to the Boston Tea Party museum
Picture of the National Mall diagram, where all buildings are shown as red rectangles. A large area with no red rectangles is highlighted in yellow. This is a joke based on the meme of airplanes with red dots showing where they got shot; they need additional armor in the areas without red dots, because planes shot in those areas did not make it back.
Screenshot of the SGDQ live steam. It shows a white guy wearing a Mahkit Baskit shirt, Citgo sign hat, and bucket of Dunks
Screenshot of a chum-box style ad which reads “struggling with negative thoughts? Discover how pet play, Yeshua’s copper teaching & divine breathwork clears the mind & revitalizes” There’s a picture of a cat with a yellow leash and a copper (?) amulet
Screenshot of Reddit’s web interface, mostly hidden by a Get The App paywall. The Ask AI box is prepopulated with the string “best meth”
Screenshot of a small flyer taped to a signpost, which reads THAI HUT IS CLOSING This week after 20 years! They've been wonderful neighbors (and don't know I"m sending this) Definitely order or go say goodbye! - Calvin St Neighbor
Screenshot of a google search for "Thai Hut Somerville closing", with an AI overview reading Thai Hut (93 Beacon St) has appeared permanently closed. The physical storefront looks abandoned. While online platforms still show menus, the restaurant has ceased operations amidst unverified viral rumors regarding a dispute between the chef and an influencer.
Picture of a bag of coffee beans labeled “Washed PNG”
Picture of a sticker on the back of a road sign, reading ‘Is it time for change?’, ‘William “Billy” Tarot’ with pentagrams below.
2x2 chart with axes of [high, low] actual overlap versus belief in [high, low] overlap; taken from the blog post
Screenshot of the Rust Foundation website. There's an orange popover reading ">> Help Fund the Maintainers Behind Rust", then the header (in blue, with one font), then "Welcoming Wild to the Rust Innovation Lab" (in a different font), with a publication date in black (unreadable) and the author listed as "Rust Foundation Team".
Edited photograph of Obama giving a medal to himself
screenshot of a Rust conference talk on Rust engines, with a slide titled "The Slice-Cell Trick". The code reads // &mut [T] -> &Cell<[T]> -> &[Cell<T>] let mut moves = Cell:: from_mut(&mut moves).as_slice_of_cels); while let Some(max) = moves.iter().max_by_key(|m| history(m.get())) { if !exchange_winning(max) { set_bad(max); continue; } emit (max); if done() { break; } Cell:: swap(&moves[0], max); moves = &moves[1..]; } Because we can make multiple shared borrows of moves, all is well in the world, and this routine emits no bounds-checks.
Meme of a goose chasing a man, yelling “Verified by who???”
Screenshot of a post from the altNOAA account reading “I’m using a fake name on the internet. I have no credibility here in the first place”
A terrible line-art drawing of a girl saying (in a speech bubble) "waow" and thinking "based based based"
Screenshot of a chat with Claude with the following text (sent by Claude) So: valid instinct, the redundancy is real, but there's a coherent reason for it if this is a deliberate thin wrapper over a C SDK. The question worth answering before judging it is whether anyone actually depends on the C-enum-numeric-equivalence, or whether that's just inherited and a union would now serve you better. (Responding in English)
Screenshot from The Good Place. It shows Michael (a white man in a suit) gesturing, captioned to read "yeah yeah, the time spiral, we've all seen it".
Screenshot of a post on Ed Zitron's blog. The header is a cartoon of Mt. Rushmore with the title "Where's Your Ed At?". The faces look strange. The title of the post is "Cargo Culture", the author is Ed Zitron, it was published Jun 23, 2026, and it's a 30 min read.
The ChatGPT logo, edited to have a dialog bubble so it looks like it's saying the quoted post
Picture of a large black-and-white bird printed on a cream-colored wall. A hotel room door is visible to the left
Picture of a door hinge which is made from two L-shaped brackets, with the hinge on the far edge of the doorframe
Picture of a small baby in a bucket-style swing. The baby is so small that the front of the swing entirely covers their face, showing only a pair of legs and a blue hat. The baby is being pushed by a lovely white woman in a black tank top and yellow pants. Wood chips litter the floor of the park, and a bright green tree peeks out from behind a fence
Screenshot of the web page; a red and green cylinder stretches over the page header
Picture of an outdoor arena built on the White House lawn. It says "UFC Freedom 250" on a banner. The area itself is a set of hooping arches, covered with blue canvas printed with white stars (like an American flag). The White House is visible behind the arena. Photo credit: Anne Lebreton / AFP via Getty Images
Screenshot of a cartoon rabbit saying "You really think someone would do that, just go on the internet and tell lies?"
Screenshot of a torrent on The Pirate Bay named "Claude Mythos Weights", uploaded 2026-06-13 by a user named damodei. It is 121.15 TiB in size. This is fictional.
Picture of the Kennedy Center. Scaffolding has been placed on the front of the building, reaching the text which reads THE DONALD J TRUMP AND THE JOHN F KENNEDY CENTER FOR THE PERFORMING ARTS
The same picture, with arrows drawn showing the ordering. It looks like a terrible attempt at a Morton / Z-order curve
Screenshot of a Google infobox about the NBA finals. The games are in the following order: Game 4 | Game 3 Game 2 | Game 1 Game 5 | Game 6
Screenshot of the Github code review screen. @jamesmunns has approved the PR with "Let's go" @hawkw has approved the PR with "sure fine whatever"
Screenshot of an iPhone with the AI summary reading Aga sent you a message about Calathea. She described it as a patterned tropical houseplant. Right below that, there's a message box from Aga reading Have you heard of Calathea? It's a patterned tropical houseplant...
Screenshot of Sabine Hossenfelder's YouTube channel, with titles like "It's over for ASML" [frowning face], "This Should Not Exist" [questioning face], "Super El Niño Is Coming" [thinking face], and "Mystery Solved?" [backdrop of DNA]
Picture of a reply from a bot reading “Wow, amazing moves! Keep sharing, love it! 😊 “
Video of a bearded white male climbing up a bouldering route.
Screenshot of syntax-highlighted Rust code, which reads /// While it may sound like the impetus for an OSHA investigation at the North /// Pole, this function is _actually_ designed to generate small (32-byte) /// chunks describing the data in the PHDRs of an ELF file. Unless the file is /// missing PHDRs, because objcopy sometimes does that for whatever reason, in /// which case we do the section headers. /// /// This is an implementation factor of both SREC and IHEX generation. fn elf_chunks(elf_data: &[u8]) -> Result<Vec<(u32, &[u8])>> {
Screenshot of a list of branches on Github, which are mkeeter/probe-that-elf mkeeter/only-load-with-a-probe mkeeter/the-slog-of-slogs
Picture of Signal, showing a message from Unknown with an un-downloaded image. The UI tells me to review requests carefully.
Screenshot of a fantasy map (of Middle-Earth) showing a bunch of lines in various colors. The lines represent trajectories of particular characters or groups in The Hobbit and The Lord of the Rings
Screenshot from an email reading ♥️ If you love Clover, when we reopen, could you commit to introducing one new person to us? Every one of you reading this is an ambassador for our mission. Tell a coworker, trick a skeptical carnivore, bring your crush. (There have been LOTS of first dates at Clovers—and some children that resulted!)
Picture of a framed cyanotype print. The frame is black. The print shows ghostly echoes of pine needles, an oak leaf, and several other assorted plants on a deep blue background
Screenshot from the rsync license (GPLv3), which reads THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
Screenshot of text reading Good — now I have enough to give you a corrected, honest answer. Let me retract some of what I said earlier.
Screenshot of the Boston subreddit's New page, which is 14 posts about a loud boom and one person complaining about the lack of matcha tea shops.
Picture of a Pokopia city. There are stone paths, benches, a fountain, and a few buildings. A Charizard is standing near a bush. Source is from https://www.reddit.com/r/Pokopia/comments/1rrr2vb/my_small_town_after_a_week_in_pokopia/
Screenshot of an article (https://slate.com/news-and-politics/2024/09/eric-adams-indictment-turkey-hotels-airplanes-crime.html) which reads For example, Adams was so reliant on the cheap flights and free business-class upgrades provided to him that he ended up on some wildly circuitous itineraries. “Because the Turkish Airline provided free travel benefits worth tens of thousands of dollars to Eric Adams,” the indictment reads, “he flew the Turkish Airline even when doing so was otherwise inconvenient.” During a 2017 summer trip from New York City to France, Adams’ partner is surprised to find out that he has scheduled a layover in Istanbul, an overshoot of some 1,700 miles from his intended destination. In what might be the most memorable Adams line in the entire document, he responds: “Transferring here. You know first stop is always instanbul.” That wasn’t the last time Adams sought an outlandish route on Turkish Airlines. When his partner wanted to plan a trip to Easter Island—in Chile—Adams “repeatedly asked her whether the Turkish Airline could be used for their flights, requiring her to call the Turkish Airline to confirm that they did not have routes between New York and Chile.” The route from New York to Istanbul to Santiago would have tacked on two unnecessary crossings of the prime meridian.
Screenshot of the AI overview, which reads There are 2 "p"s in Google, specifically at the very end of the word (g-o-o-g-l-e). (If you are asking about its parent company, Alphabet, it stands for Alphabet Inc.)
Photograph of Eric Adams, former mayor of NYC, edited to have a speech bubble so it looks like he's saying the quoted tweet.