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424 karma · joined February 1, 2012

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te··on Ping-pong robot beats top-level human players
Here's an entrance to the rabbit hole: https://www.a1k0n.net/2021/01/22/indoor-localization.html
te··on Scientific audio equipment analysis with analyzer shows no difference in quality
> build the speaker set I had in mind based on Siegfried Linkwitz's knowledge > sounds like the artists are actually playing in the livingroom

I'd eagerly read a write-up of what you did.

te··on A simple way to measure knots has come unraveled
https://www.netknots.com/rope_knots/top-10-rope-knots
te··on Zig Software Foundation 2025 Financial Report and Fundraiser
I'm going to go out on a limb and suggest that number is not actually employee income tax, even though the report seems to suggest the same. Employee income tax is an expense of the employee, not the employer. If it is income tax withholding, it's way too small for $150k+ of employee comp, which is another reason I don't think it's that. Instead, I expect this tax line item to be primarily the employer share of FICA tax, which is typically considered a payroll tax instead of an income tax.
te··on The Little Book of Linear Algebra
codingthematrix.com
te··on “Secret Mall Apartment,” a Protest for Place
Really interested in seeing this movie, but lol at the thought that the owners of the mall ever saw a single cent from envelopes of cash stuffed under an office door.
te··on Explainable Linear Programs
> which would take longer than the heat death of the universe to find the global maxima

Sure, if you're using brute force, instead of a polynomial time algorithm.

> It doesn't matter what algorithm you use, finding the absolute best solution and proving it is impossible.

Hard disagree: https://en.wikipedia.org/wiki/Hungarian_algorithm

Linear Assignment seems a very strange choice to illustrate the utility of meta-heuristics, when that particular problem has a polynomial-time solution algorithm that has been known for 70 years.

te··on Explainable Linear Programs
Watched your Linear Assignment video, and the whole time I'm thinking why would one ever contemplate a meta-heuristic for Linear Assignment when Hungarian/Munkres runs in polynomial time? I think I must be missing some context.
te··on Robin Warren, pathologist who rewrote the science on ulcers, has died
https://my.clevelandclinic.org/health/diseases/8098-hiatal-h...
te··on The Operational Wargame Series: The best game not in stores now (2021)
> "The turns do not take very long at all and teams of players can get in 2-3 turns in a normal work day."

Game does sound very cool, but lol, author has different game-playing expectations than I do.

te··on Show HN: Dimity Jones in Puzzle Castle: An Electronic Escape Novel
Hmmm. The original, in fact, does NOT have the 0x0a at the end of the file; however, in process of deleting first part of file up through and including "1.#####", my linux command line tools (or vim?) added one there (unbeknownst to me at the time). I proceeded to solve first puzzle with the 0x0a there at the end in the head-shortened ciphertext, and I got readable plaintext, but my sha256sum does not match yours. If I remove the 0x0a, I get neither readable plaintext nor a matching sha256sum.

(btw, love this project, thanks for sharing it)

te··on Encoding tic-tac-toe in 15 bits
I had a very similar problem this week, trying to encode 5**13 states in a 32-bit int. Should be doable with this. What is this encoding called? I haven't seen it before.
te··on Finding the Air Cannon
Epic comment and diagram, thanks. From this, how can we calculate bearing and distance from one of our locations to the source? Edit: I see that we can use multilateration suggested by parent-sibling comment if we just had distance to source (ie radius of unique tangent circle).
te··on Three American climbers solve the 'last great problem in the Himalayas'
As a civilian, I'm surprised to learn, with all the technical improvements in mountaineering gear, that frostbite on gloved hands is still an unsolved problem.
te··on Sodium batteries offer an alternative to tricky lithium
I have one, and they are as great as you expect. Used 2013 Nissan Leaf's can be had for $5k or less.
te··on Could a near-Earth asteroid be a piece of the moon?
In the transitions between quasi-satellite orbit and horseshoe orbit, why does it not hit Earth?
te··on Johnny Cash Has Been Everywhere (Man)
Starts slow, but really gets going.

https://www.youtube.com/watch?v=1OZWi-mTkNU

te··on A statistical analysis of the work of Bob Ross (2014)
Love Bob Ross, but that's a sad little chimney. Actually a vent pipe.
te··on AI fooled voice recognition to verify identity used by Australian tax office
Next up: https://www.schwab.com/voice-id
te··on Ask HN: What have you created that deserves a second chance on HN?
Is it solvable starting from any circle? Or are some starters unsolvable?
te··on Ask HN: Why haven't bookmarks been re-invented?
Oooh, I like this a lot. Source available?
te··on Does Someone Know My Name?
So all you need to do to identify strangers is snap a photo and mail it to the LoC?
te··on Show HN: Killer Crossword - A crossword puzzle variation with no clues
Very fun. Didn't realize I was being timed? When did the timer start? Maybe show it on screen real-time? Increases the pressure!
te··on Water Pump Theory
Or, just try holding your breath for 30-45 seconds. I'm betting you've discovered a round-about way to achieve the same mechanism of action (raising level of CO2 in your blood). https://www.bbc.com/future/article/20140127-do-hiccup-remedi...
te··on On Aging Alone (2021)
https://threadreaderapp.com/thread/1429941683362357250.html
te··on Rules of Card Games: I Doubt It (1998)
My family played Pounce, as you describe. Our heyday was the mid-1980's, in a mid-Atlantic state.
te··on Quordle: Four Wordles in One
I think this (squareword) would be even more fun with a toggle button to transpose the square.
te··on Building an iPod for 2022
However, Rockbox does support Opus on other devices. Been using it exclusively on my Sansa Clip+ for at least a year.
te··on The Kelly criterion: How to size bets (2019)
Big book. Any of the chapters/papers within that you'd particularly recommend?
te··on Show HN: I built a CNC-machine from scratch, using 40x 3D-printed parts
Sounds really cool! Got pics?
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