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iPhone Duo

https://www.apple.com/iphone-duo/
960•thecosmicfrog•8h ago•1753 comments

Shopify acquires Tailwind

https://tailwindcss.com/blog/tailwind-is-joining-shopify
913•EdwinHoksberg•13h ago•366 comments

What do Visa and Mastercard do? An intro to card networks

https://tautology.town/2026/06/01/card-networks.html
403•evakhoury•1d ago•231 comments

Show HN: What if the speed of light was 5 km/h?

https://rivendell.dmitrybrant.com/relativity/
19•dmitrybrant•1h ago•15 comments

Growing proof that autonomous cars save lives

https://spectrum.ieee.org/are-self-driving-cars-safe
243•bookofjoe•9h ago•441 comments

AirPods 5

https://www.apple.com/newsroom/2026/09/apple-introduces-airpods-5-with-best-in-class-open-ear-act...
395•awad•9h ago•317 comments

Show HN: Compute polynomials twice as fast

https://thomasahle.com/fast-polynomials/
25•thomasahle•18h ago•8 comments

No Man's Sky Cosmos

https://www.nomanssky.com/cosmos-update/
313•Limb•11h ago•330 comments

iPhone 18 Pro and iPhone 18 Pro Max

https://www.apple.com/newsroom/2026/09/apple-debuts-iphone-18-pro-and-iphone-18-pro-max/
299•meetpateltech•9h ago•311 comments

GPT-6 Astra, looped transformers, and hidden reasoning

https://magazine.sebastianraschka.com/p/gpt-6-astra-looped-transformers-and
361•ModelForge•12h ago•128 comments

Factoring RSA 260

https://cognition.com/blog/factoring-rsa-260
49•samyok•6h ago•7 comments

Apple Watch Series 12

https://www.apple.com/newsroom/2026/09/introducing-apple-watch-series-12-with-the-all-new-health-...
227•Lealen•9h ago•272 comments

Desert Ant Labs: local, fast models that run on device

https://desertant.com/blog/introducing-desert-ant-labs/
407•willwhitedc•15h ago•93 comments

Qwen 3.8 follows GPT-5.5 Pro reasoning prefills

https://gist.github.com/wsxiaoys/e0286dc6bb624ff5fdf49e7f4c528ba3
183•wsxiaoys•9h ago•74 comments

Automattic's board forces CEO Matt Mullenweg into leave of absence

https://techcrunch.com/2026/09/09/automattics-board-forces-ceo-matt-mullenweg-into-leave-of-absence/
69•LeoPanthera•3h ago•118 comments

GNU Radio in the browser

https://gnuradioworld.com/
178•kristianpaul•11h ago•23 comments

Rivian's gambit for full autonomy

https://spectrum.ieee.org/rivian-self-driving
39•1970-01-01•1d ago•62 comments

Be Using Rootless Containers

https://blog.miguelgrinberg.com/post/you-should-be-using-rootless-containers
5•ibobev•1d ago•1 comments

How I advertise malicious software on Google Ads

https://xlii.space/eng/malicious-software-on-google-ads/
362•xlii•15h ago•221 comments

Seismic Isolation

https://www.ligo.caltech.edu/page/vibration-isolation
7•pillars•3d ago•0 comments

The UN challenges five centuries of cartography

https://www.not-ship.com/united-nations-map/
56•speckx•10h ago•69 comments

The Kuycon P20 – 28" 4500x3000px 3:2 monitor

https://taoofmac.com/space/reviews/2026/09/06/1800
27•zdw•3d ago•17 comments

A Stupid Idea for AI Alignment We Came with by Looking at Specification Gaming

https://slimemoldtimemold.com/2026/08/05/a-stupid-idea-for-ai-alignment-we-came-up-with-by-lookin...
4•cpeterso•1h ago•0 comments

Planet Labs' open satellite feed

https://tech.marksblogg.com/planet-labs-open-satellite-feed.html
150•marklit•11h ago•27 comments

Understanding the recent DDoS attack against Read the Docs

https://about.readthedocs.com/blog/2026/09/2026-ddos-attack/
164•davidfischer•11h ago•55 comments

Blizzard Workers Win Historic Union Contract

https://www.gamespot.com/articles/blizzard-workers-win-historic-union-contract-that-could-set-a-n...
116•dbg31415•4h ago•33 comments

Use Vsock with Libzmq

https://blog.remijouan.net/posts/libzmq-vsock-pyzmq/
30•remijouannet•2d ago•3 comments

Bespoke: A programming language for people who say please

https://blog.hofstede.it/bespoke-a-programming-language-for-people-who-say-please/
138•birdculture•3d ago•31 comments

Electrostatic Cathode Ray Tube Project 1 (2014)

https://labguysworld.com/Project_ESCRTs_001.htm
15•userbinator•1d ago•4 comments

Claude, change the “Add to Cart” button to blue

https://opusfived.dev/
1041•matthieu_bl•17h ago•406 comments
Open in hackernews

Show HN: What if the speed of light was 5 km/h?

https://rivendell.dmitrybrant.com/relativity/
18•dmitrybrant•1h ago
I've always wanted to make a visualization where the speed of light was scaled down to human speeds, so that we could intuit relativistic effects with everyday objects. And here is the first version of it!

Comments

skulk•32m ago
in the real world if the speed of light was 5 km, we'd probably be a lot smaller!
dragonfax•29m ago
Well I'm not a physicist, but we all travel through time at the speed of light. With a much smaller speed of light, I think relativistic speeds would be much easier to achieve. I.e. you could age noticeably differently than your family on a solo car drive to get groceries.
Kranar•19m ago
The more accurate statement is that all objects have the same speed in spacetime. Time is just one dimension of spacetime and objects do not all travel along that dimension with the same speed. For example, an object travelling through space at close to the speed of light will have a speed along the time dimension close to zero.

Having said that... this is mostly a slogan and makes for good Youtube videos, but it falls apart the moment you subject it to even the most basic scrutiny. For one... it doesn't make sense to talk about a speed through time since speed is literally a measure of change with respect to time, so a change in time with respect to time doesn't make any sense.

But as a slogan, it captures the idea that motion through space and the rate of your own clock are tightly linked together.

pixl97•7m ago
>it doesn't make sense to talk about a speed through time

Only if you're talking about other people's clocks and not your own. Your own clock is one second per second, but someone else's may be slower or faster relative.

eggn00dles•10m ago
well the meter and the kilogram themselves are either completely or partially defined by the speed of light. its a fundamental constant that a large portion of nature depends on, so i doubt such surgical changes could be realized.
bananaflag•26m ago
Btw there is also this

https://en.wikipedia.org/wiki/A_Slower_Speed_of_Light

wging•25m ago
See also https://gamelab.mit.edu/games/a-slower-speed-of-light/, a 2012 game that did the same thing
vunderba•7m ago
There's a great demo video of it as well.

https://youtu.be/uu7jA8EHi_0

Some of the details in the paper are super cool. Since the game pulls "c" down to near walking speed, you receive photons at different rates depending on their direction relative to your motion (relativistic aberration / searchlight effect) resulting in neat visual shifts.

I don't usually download games, but I might have to make an exception just to try it out.

gryfft•21m ago
It would be nice to add controls for mobile.
scotty79•18m ago
Next step, taking into account effects of acceleration according to general relativity.
tomjakubowski•15m ago
MIT Game Lab made a take on this back in 2012.

https://gamelab.mit.edu/games/a-slower-speed-of-light/

tristanj•8m ago
Velocity raptor is a free game that accurately simulates the effects of special relativity. It slows down the speed of light to 3m/s and you solve puzzles. https://www.testtubegames.com/velocityraptor.html

There is a helpful FAQ which explains all the weird things happening, such as length contraction, time dilation, and color shifting: https://testtubegames.com/srel101.html

fuzzfactor•5m ago
Can't see your website but I would think everything you see would have so much latency it would be worse than today's internet with dialup using 2GB of RAM on an Atom CPU ;)
zrail•5m ago
The first few Discworld books explore this a little bit too. I think pterry dropped the concept after that, I don't really remember it later in the series.