Top Stories

Men who stare at walls

464 points · alexselimov.com

The most upvoted essay on HN today, and the kind of post that crystallizes something readers have been quietly feeling. Alex Selimov’s argument is short: the engineers and scientists he most admires all kept time in their day to do nothing in particular — to walk, to stare out the window, to let problems compost — and that this kind of unstructured thinking is being squeezed out by Slack, agentic tools that always have something to do, and the social expectation that visible activity equals work. The 207-comment thread is unusually reflective for HN, with a lot of senior practitioners describing how they actually carve out wall-staring time and how badly they regret losing it in their twenties. Worth reading even if (especially if) you think you’re too busy.

Is my blue your blue?

373 points · ismy.blue

A small, beautifully made interactive that’s been forwarded around tech Slacks all day: a calibrated color picker shows you a sequence of blue/green hues and tells you exactly where your personal boundary sits relative to the population. The 251-comment thread is the substance — a useful primer on opponent-process color vision, an excellent debunking of the recurring “everyone sees colors differently” Twitter discourse, and a side-conversation about what it would actually take to study color perception at internet scale. Try it once, then read the thread; you’ll learn more about color than you have in years.

Microsoft and OpenAI end their exclusive and revenue-sharing deal

777 points · bloomberg.com

Yesterday’s lead story has only kept climbing, now nearing 800 points and 700 comments — the most discussed item on HN this week by a wide margin. The new context worth noting: a fresh subthread of OpenAI and Microsoft employees (anonymized, but credibly so) has emerged describing what the unwind actually looks like internally — a cleaner separation of model weights and IP, OpenAI signing fresh capacity deals with Oracle and CoreWeave, and Microsoft’s own MAI team being given explicit license to ship competitive frontier models. If you only read one HN comment thread this week, this is the one.

267 points · github.com/weeblabs

DSPi is the kind of hardware-meets-firmware project HN was made for: a complete real-time audio DSP stack — parametric EQ, FIR/IIR crossovers, reverb, compression, sample-rate conversion — running on a $4 RP2040 microcontroller with audio-quality outputs that would have required dedicated DSP silicon a decade ago. The 77-comment thread digs into the actual engineering: how the author squeezes I²S in, I²S out, and the DSP graph into the Pico’s two cores; why the choice of fixed-point math beats float on this chip; and a thoughtful comparison with the more expensive Teensy and ADAU options. A great weekend project entry point if you’ve been wanting to learn embedded audio.

Super ZSNES — GPU Powered SNES Emulator

251 points · zsnes.com

A surprise revival: ZSNES — the assembly-optimized SNES emulator that defined the 2000s emulation scene before bsnes/higan took over on accuracy — has been reborn as Super ZSNES, with the entire renderer rewritten to run on the GPU. The 69-comment thread is half nostalgia and half careful technical comparison with bsnes-hd and Mesen-S, and the consensus is real: Super ZSNES nails high-refresh-rate, integer-scaled output on modern hardware in a way the accuracy-first emulators have always struggled with. Whether it displaces the incumbents is an open question, but it’s the most interesting movement in the SNES emulation world in five years.

FDA approves first gene therapy for treatment of genetic hearing loss

220 points · fda.gov

A real biotech milestone: the FDA has approved the first single-dose gene therapy for OTOF-mediated congenital hearing loss, granted under the agency’s National Priority Voucher pathway. The 82-comment thread is exactly the right mix — practitioners explaining what OTOF mutations actually do to the hair-cell synapse, parents of affected children describing the trial outcomes they’ve watched in real time, and a careful sub-discussion of pricing and access (the list price hasn’t been disclosed, but voucher-pathway therapies have historically launched in the $1–3M range). A genuinely good news story with the usual asterisks about cost and equity.

Networking changes coming in macOS 27

210 points · eclecticlight.co

Howard Oakley’s deep walkthrough of the macOS 27 networking stack — already covered yesterday but now firmly a top-of-front-page story with 184 comments — is the post to bookmark before WWDC. The headline change is the long-anticipated retirement of pf in favor of a new userland-configurable filter framework, but the more interesting practical bits are buried deeper: cleaner private-relay/VPN interaction, a new per-app DNS configuration API, and a quiet but breaking change to how multi-homed Macs choose default routes. If you ship anything that touches the network on Mac, read this before your beta cycle.

The woes of sanitizing SVGs

188 points · muffin.ink

A sharp engineering write-up from a Scratch developer on what it actually takes to safely accept user-uploaded SVGs at internet scale, now with 76 comments and climbing. The post (and thread) is essentially a public service announcement: SVG is “HTML with a different file extension” — script execution, foreignObject embedding, CSS-driven exfiltration, the works — and no off-the-shelf sanitizer cleanly handles all of it. The most useful sub-thread is a list of specific edge cases the author hit at Scratch that DOMPurify and svg-sanitizer both miss. If your product takes user SVG, this is required reading; if it doesn’t, the quiet recommendation is to rasterize first and ask questions later.

Easyduino — Open Source PCB Devboards for KiCad

178 points · github.com/Hanqaqa

A genuinely useful open hardware release: a set of beautifully laid-out, MIT-licensed KiCad templates that turn the standard Arduino-compatible microcontroller footprints into ready-to-fab PCB devboards. The 27-comment thread is the practical part — people sharing fab quotes from JLCPCB and PCBWay, debating component substitutions for current chip-supply realities, and pointing out which footprints could be improved. A great “skip the schematic stage and start prototyping” resource for anyone who’s been intimidated by KiCad.

The quiet resurgence of RF engineering

151 points · atempleton.bearblog.dev

A thoughtful essay on a real industry trend: after two decades in which “RF engineer” was a niche specialty most software people barely thought about, demand is rocketing back — driven by 6G research, satellite broadband (Starlink and its competitors), automotive radar, and the radar/EW work coming out of the Ukraine and Red Sea conflicts. The 83-comment thread is full of working RF engineers describing salary inflation, the brutal experience hiring junior talent in a field where most universities cut their RF programs years ago, and a useful book/course list for software people curious enough to cross over. A career-relevant read if you’ve been wondering where the next under-supplied skill is.