#video by #Makers-Muse about #3D-printing floppy elastomer filament #materials that aren’t TPU, like PEBA, polyether block amide (?) which apparently you have to print at about 250° to get good layer adhesion. Also, foaming TPU, glass-filled polybutylene terephthalate (PBT-GF), and regular polypropylene, for which you need to coat your bed with polypropylene packing tape or something to get it to stick. Also a TPU/nylon mix and PVA as a water-soluble elastomer. #manufacturing
#video #toread about making #DIY molds from flour and silicone #materials #toread
#video of #Evan-and-Katelyn #manufacturing #concrete keycaps for a custom keyboard with PVA glue replacing some of the water in the cement (like a quarter or half or something), using personal vibrators to get the mix down into the keycap molds where they’re overmolding keycap stems made with #3D-printing. Also they tried adding 3% chopped fiberglass to their concrete mix, which is totally going to fail. They also tried adding more sand. To suppress bubbles, they loaded the keycaps into a pressure pot to cure. The fiberglass concrete wasn’t sandable, breaking apart. The PVA concrete felt “super hard and dense”. They also made the outside of the case out of concrete. It weighs three pounds, and the wrist rest another 1.7.
#ARM #asm #SIMD intrinsics for (vertical) addition. vaddq_u16 (vadd.i16) and the like.
Complete #ARM #SIMD #asm intrinsics list, including the strided things. Reference #documentation.
#YouTube pays on the order of US$5000 for a million views, but “There was a huge peak in the middle of my timeline where one of my videos went semi-viral and accounts for almost half of my channel’s views.” But he’s doing cryptocurrencies and investment banking, so a fraction of that is normal.
AIR Media-Tech says typically #YouTube pays US$3000 to US$5000 per million views.
Gelman’s #statistics #ebook “Bayesian Data Analysis, Third edition” #PDF #toread (677 pp.)
Gelman’s #statistics blog
Scm2wasm: A #Scheme to #WASM compiler in 600 lines of C, making use of WASM GC #compilers #toread. wasmtime -Wgc --invoke start output.wasm
really interesting discussion of #WASM, including stuff by Mariano Guerra on #compilers
A paper on #QC complexity: “the first paper I’ve ever put out for which a key technical step in the proof of the main result came from AI—specifically, from GPT5-Thinking. (...) Now, in September 2025, I’m here to tell you that AI has finally come for what my experience tells me is the most quintessentially human of all human intellectual activities: namely, proving oracle separations between quantum complexity classes. Right now, it almost certainly can’t write the whole research paper (at least if you want it to be correct and good), but it can help you get unstuck if you otherwise know what you’re doing, which you might call a sweet spot. Who knows how long this state of affairs will last? I guess I should be grateful that I have tenure.”
Dubner #interview with Dan Wang, who wrote "Breakneck" about #China #toread
how nondeterminism can arise in #AI #neural-networks due to some kind of floating-point error? #toread
“Man Fined for Engineering Without a License Was Right All Along” in 02020: “Mats Järlström, the Oregon electrical engineer who challenged the state’s traffic light timing. What began as a simple quest to help his wife avoid an unfair ticket turned into a multi-year saga after the Oregon Board of Engineers fined him thousands of dollars—simply because he dared discuss the issue when he wasn’t technically a traffic engineer.” #USA #politics #news
#Microsoft blocks #Azure’s use by #Israel’s #IDF to spy on Palestinians: “Tech firm ends military unit’s access to AI and data services after Guardian reveals secret spy project”; Unit 8200 had 8000 terabytes (8 petabytes) of captured phone calls in a Netherlands Azure data center. “Within days of the Guardian publishing the investigation, Unit 8200 appears to have swiftly moved the surveillance data out of the country. (...) Intelligence sources said Unit 8200 planned to transfer the data to the Amazon Web Services cloud platform.” #news #politics
“Egypt warned Israel days before Hamas struck, US committee chairman says.” #Israel #politics #history #news
"Infliximab" was approved in the #USA in 01998. #history #drugs #medicine
#paper on the #history of #infliximab, “first such therapeutic mAb, an anti-TNF-α”. #drugs #medicine
#paper “Review: Lessons Learned From Clinical Trials Using Antimicrobial Peptides (AMPs)” #drugs #medicine #history #magainin
#DHH on the “best names ever” list that caused his company a lot of trouble #politics #history
Graham Linehan got arrested upon entering the #UK because he tweeted, “If a trans-identified male is in a female-only space, he is committing a violent, abusive act. Make a scene, call the cops and if all else fails, punch him in the balls.” He thinks this was an unreasonable response. #politics #trans
#DHH comes out as believing that descendants of immigrants to Britain aren’t “native Brits” and that he wouldn’t want to live around them: “I thought I might move there one day. That was then. Now, I wouldn’t dream of it. London is no longer the city I was infatuated with in the late ‘90s and early 2000s. Chiefly because it’s no longer full of native Brits. In 2000, more than sixty percent of the city were native Brits. By 2024, that had dropped to about a third. A statistic as evident as day when you walk the streets of London now.” Then he endorses Tommy Robinson! “But a demographic nightmare worse than [the prospect of Denmark being less ethnically Danish] has already enveloped London!” #racism #politics #UK
Mike Perham (Sidekiq) stopped donating US$250k a year to #Ruby Central because they didn’t deplatform #DHH at RailsConf 2025, and confirms that in this Reddit thread.
#DHH in 02022 on not keynoting RailsConf due to #politics. #Ruby
#Ruby Central’s announcement in May that #DHH will keynote the final RailsConf. #politics #Mastodon
“#Ruby Central recently took over a collection of open source projects from their maintainers without their consent.” Apparently because Shopify asked them to: "1. Ruby Central was struggling for money. 2. Sidekiq withdrew its $250,000/year sponsorship for Ruby Central because they platformed DHH at RailsConf 2025. 3. Shopify demanded that Ruby Central take full control of the RubyGems GitHub repositories and the bundler and rubygems-update gems, threatening to withdraw funding if Ruby Central did not comply. (...) 11. Shopify specifically demanded that at least one of the RubyGems maintainers, André Arko, be excluded from returning to the project. André has been working on RubyGems for over a decade and was also one of the founders of Ruby Together, an organization that merged with Ruby Central.” #politics
Grinich says, “Hi HN! I’m the founder of "WorkOS" (https://workos.com) We provide a developer API for making your app enterprise-ready. You can quickly add features including SSO/#SAML, Director Sync (#SCIM), Audit Logs, and more.
WorkOS is “Plaid for enterprise IT systems.””
#video by #Breaking-Taps on #manufacturing optically-clear epoxy copies of glass lenses by casting in silicone molds (Smooth-on Mold Max XLS); he gets 8.90nm RMS surface roughness on his copy, worse than the 1.74nm RMS surface roughness on the glass original, according to his AFM, plenty good for #optics. It worked easily for 10mm lenses, but it was difficult to get the process to work with 100mm lenses, with hazy surfaces (due to mold release), deviations from sphericality, etc. He says you can’t polish, lap, or grind plastic, which I don’t think is true of all plastics. A reader says, “Hey, I just want you to know that you can actually polish a plastic lens. I’m a lens maker in Canada and everything we do is plastic. We don’t always do PC but we do a ton of other materials. Everything gets polished.
we use a liquid polish and some abrasive pads, and I’m not exactly certain what kind of polish you could use for it, but it’s definitely something we do.”, and another comments, “I worked for years in a surface lab lapping and polishing plastic lenses all day. It’s absolutely practical”. A third says, “YES you can polish plastic as good as you can polish glass! You just need to use finer grit paper or less abbrasive [sic] materials and also you get the best result if you do wet sanding and then wet polish with VERY high grit sandpaper and oil or water. I do it myself so YES you can!” He sputtered metal (60nm silver) onto the glass as an alternative mold release that wouldn’t create micron-scale roughness. Smooth-on Accel-T tin-cure accelerator additive caused more shrinkage during curing of the silicone, ruining the figure of his mold. Relatedly, he says you want the resin to cure as slowly as possible, because fast-cure silicones shrink more. Mold Max XLS he says is 1000ppm shrinkage, EpoxaCast 690 is 2000ppm.
#Marco-Reps #metrology #precision #toread #electronics video on an 0.1-ppb-resolution Guildline Model 9930 direct-current resistance comparator from the 01960s, specifically November 24, 01969, according to the light-beam galvanometer inspection card. At 2'21" there’s a very alarming CERN slide, “The availability of magnetic materials has been declining over the years.
As of 2024 the assembly can be produced, but there is no replacement yet for the obsolete radial shield material (Nanophylm).” #collapse
The key here is that numbers of transformer windings “don’t have temperature coefficients or long-term drifts”, so they’re accurately ratiometric in a way that’s stable until and unless you bend the wire.
Guildline gave him the service manual, SM9930-H-00.
Internally it has an ovenized Weston cell in a test tube, which is used with a second light-beam galvanometer for feedback control of a 50mA current through a critical precision resistor, which is wire wound around a several-kilogram cylinder of brass; the soldered connections to the manganin (?) wires are stuck into a hole deep inside the brass to reduce possible thermal EMFs.
The nanovolt amplifier is a pair of antiparallel photocells powered by a lightbulb whose light is deflected by a third mirror galvanometer, this one 3.6kΩ.
"Nebraska" was the #Squeak reimplementation of #Self’s Kansas shared remote desktop system.