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Coding Without a Laptop – Two Weeks with AR Glasses and Linux on Android

https://holdtherobot.com/blog/2025/05/11/linux-on-android-with-ar-glasses/
113•mikenew•3d ago•28 comments

Dead Stars Don't Radiate

https://johncarlosbaez.wordpress.com/2025/05/17/dead-stars-dont-radiate-and-shrink/
118•thechao•3h ago•53 comments

Mystical

https://suberic.net/~dmm/projects/mystical/README.html
59•mmphosis•2h ago•3 comments

How to have the browser pick a contrasting color in CSS

https://webkit.org/blog/16929/contrast-color/
100•Kerrick•4h ago•31 comments

Palette lighting tricks on the Nintendo 64

https://30fps.net/pages/palette-lighting-tricks-n64/
165•ibobev•6h ago•27 comments

Directory of MCP Servers

https://github.com/chatmcp/mcpso
18•saikatsg•1h ago•1 comments

Large Language Models Are More Persuasive Than Incentivized Human Persuaders

https://arxiv.org/abs/2505.09662
13•flornt•1h ago•0 comments

If nothing is curated, how do we find things

https://tadaima.bearblog.dev/if-nothing-is-curated-how-do-we-find-things/
93•nivethan•5h ago•56 comments

Push Ifs Up and Fors Down

https://matklad.github.io/2023/11/15/push-ifs-up-and-fors-down.html
294•goranmoomin•11h ago•124 comments

Show HN: I built a knife steel comparison tool

https://new.knife.day/blog/knife-steel-comparisons/all
67•p-s-v•3h ago•50 comments

Wacom drawing tablets track the name of every application you open

https://robertheaton.com/2020/02/05/wacom-drawing-tablets-track-name-of-every-application-you-open/
39•dvrp•1h ago•10 comments

Moment of heart's formation captured in images for first time

https://www.theguardian.com/science/2025/may/13/heart-cells-mouse-embryo-science-research
46•giuliomagnifico•4d ago•3 comments

How I fixed the infamous Basilisk II Windows "Black Screen" bug in 2013

https://www.downtowndougbrown.com/2025/05/how-i-fixed-the-infamous-basilisk-ii-windows-black-screen-bug-in-2013/
40•zdw•2d ago•2 comments

NASA Observes First Visible-Light Auroras at Mars

https://www.jpl.nasa.gov/news/nasa-observes-first-visible-light-auroras-at-mars/
18•pseudolus•3d ago•2 comments

O2 VoLTE: locating any customer with a phone call

https://mastdatabase.co.uk/blog/2025/05/o2-expose-customer-location-call-4g/
98•kragniz•8h ago•12 comments

A Simulation in C++ of Joseph Weizenbaum's 1966 Eliza

https://github.com/anthay/ELIZA
15•m1guelpf•4h ago•2 comments

JavaScript's New Superpower: Explicit Resource Management

https://v8.dev/features/explicit-resource-management
267•olalonde•15h ago•169 comments

Espanso – Cross-Platform Text Expander Written in Rust

https://github.com/espanso/espanso
7•kartikarti•3d ago•1 comments

A kernel developer plays with Home Assistant

https://lwn.net/SubscriberLink/1017720/7155ecb9602e9ef2/
149•pabs3•19h ago•168 comments

Insurance for AI: Easier Said Than Done

https://loeber.substack.com/p/24-insurance-for-ai-easier-said-than
36•sebg•3d ago•16 comments

Japan's IC cards are weird and wonderful

https://aruarian.dance/blog/japan-ic-cards/
257•aecsocket•2d ago•201 comments

OBNC – Oberon-07 Compiler

https://miasap.se/obnc/
53•AlexeyBrin•9h ago•15 comments

The longest train journey is epic – but nobody's ever taken it

https://bigthink.com/strange-maps/portugal-to-singapore-train/
68•PaulHoule•3h ago•21 comments

Catalog of Novel Operating Systems

https://github.com/prathyvsh/os-catalog
134•prathyvsh•13h ago•50 comments

Lufthansa plane flown by autopilot after pilot faints in cockpit

https://www.scmp.com/news/world/europe/article/3310779/lufthansa-plane-flown-autopilot-after-pilot-faints-cockpit
34•gscott•2h ago•21 comments

Gnosis Evolve MCP for Claude Desktop

https://github.com/kordless/gnosis-evolve/blob/main/README.md
7•kordlessagain•4h ago•0 comments

A library of words: Discovering Roget's Thesaurus (2023)

https://austinkleon.substack.com/p/a-library-of-words
3•NaOH•2d ago•0 comments

Open Problems in Computational geometry

https://topp.openproblem.net/
80•nill0•11h ago•12 comments

Implementing a RISC-V Hypervisor

https://seiya.me/blog/riscv-hypervisor
94•ingve•13h ago•4 comments

"We would be less confidential than Google" Proton threatens to quit Switzerland

https://www.techradar.com/vpn/vpn-privacy-security/we-would-be-less-confidential-than-google-proton-threatens-to-quit-switzerland-over-new-surveillance-law
176•taubek•6h ago•106 comments
Open in hackernews

Show HN: I built a knife steel comparison tool

https://new.knife.day/blog/knife-steel-comparisons/all
67•p-s-v•3h ago
Hey HN!

I'm a bit of a knife steel geek and got tired of juggling tabs to compare stats. So, I built this tool: https://new.knife.day/blog/knife-steel-comparisons/all

It lets you pick steels (like the ones in the screenshot) and see a radar chart comparing their edge retention, toughness, corrosion resistance, and ease of sharpening on a simple 1-10 scale.

It's already been super handy for me, and I thought fellow knife/metallurgy enthusiasts here might find it useful too.

Would love to hear your thoughts or any steel requests!

Cheers!

Comments

kurthr•2h ago
It seems like the steel data comes from larger database on hardness/toughness/corrosion? Can you say where that data is coming from or if it's your own measurements? If you could show the data (eg HRC) that supports the radar chart it would be easier for a purchaser to know if their steel actually meets the purported performance after purchase.

I guess what confuses me most is that heat treatment/hardening seem crucial to understanding how a knife is going to perform, but that seems left out. It's even possible to have a great treatment on a blank and screw it up (overheat) when doing the initial edge shaping. Furthermore, the sharpening angle of a blade edge seems to greatly affect edge retention especially for softer steels. It would be great to know what angles different (properly hardened) steels could reasonably support. That's something the user can control after purchase.

LarsAlereon•10m ago
Looking at some of the comparisons, the data appears to be (I could be wrong) scraped from this article by Dr Larrin Thomas based on his personal research and testing, possibly also including some of the other articles on his website: https://knifesteelnerds.com/2021/10/19/knife-steels-rated-by...
bberenberg•2h ago
I would be interested to see all the steel types ranked by total surface area within the polygon.
p-s-v•1h ago
good idea... i could add that
smiley1437•55m ago
I went through manually and these appear to have the highest volumes:

H1

H2

CPM Magnacut

Sandvik 12C27

Interestingly they are all weak on Edge Retention.

shawn_w•33m ago
Calling magnacut weak on edge retention is an... interesting take. It's not record setting, but it's far, far above the other 3 you listed.

The data this site is using really seems questionable.

reconnecting•2h ago
Impressive work. I've always wondered how it's possible to "decompile" steel types. For example, one of my everyday use knives is a Kabelmesser pocket knife (WW2). It's probably from Solingen, although there's no logo on it.

I really like it because of the high-carbon steel, but I have no idea what specific type of steel was used, as I don't see much of such steel these days.

Onavo•2h ago
It's not hard, just expensive. You need to pay a lab to do it, and the testing is very much destructive most of the time.
dehrmann•1h ago
XRF might be able to non-destructively tell you the alloy.
bobmcnamara•1h ago
The magic spice gun was my first thought as well, but they struggle to measure lighter elements like carbon.
adamgordonbell•2h ago
Anyone else like ceramic knives? I have a couple paring knives.

Super sharp but very brittle.

MrBuddyCasino•2h ago
I would never buy a knife you can’t sharpen. Nothing stays sharp forever.
adamgordonbell•1h ago
They can be sharpened to a very sharp edge that they retain for a long long time.

In my vague home use, brittleness leading to chipping is more of an issue.

virtue3•2h ago
Leans too far into disposable culture. Even a solid steel knife and a cheap electric sharpener will last longer.

And you can sharpen all your paring knives etc.

jofer•1h ago
We received a two knife set as a wedding gift many years ago. This was well before they were common, and it was quite a nice gift. I strongly agree with the "don't buy a knife you can't sharpen" point that folks often make, but ceramic knives do have their niche.

They're great for minimizing oxidation along cuts. E.g. cutting iceberg lettuce and avoiding having the edges turn brown. They're also very lightweight, which is nice for some things, while being bad for others. I'd never use them the way I do my workhorse chef's knife, but there are certainly tasks I prefer them for. Dicing lots of hot peppers comes to mind, oddly enough, as does some very precise and relatively tedious knifework like making very even matchstick cuts for carrots/radishes/etc (the large one has a very wide blade, which is great for this, and is lightweight enough to reduce fatigue).

Overall, I can see why folks like them. It's not really the "no need to sharpen" point. It's more the "lightweight and very thin" part, along with a non-oxidizing edge.

I'm still kind of opposed on principle, I suppose, but I do use the set we were gifted fairly often, despite having some very nice steel cutlery that I'm very fond of. I can't blame anyone for buying them now that they're priced more reasonably than they used to be.

loloquwowndueo•1h ago
*knives

Also - paring knife, not pairing knife.

eichin•1h ago
I haven't used one for food yet, but I picked up a cheap ($35) kyocera as a workshop knife and it's been great; dropped it on concrete and knocked a 1mm² chunk off of the very tip, but the edge is still great after six months of casual abuse (mostly cardboard, rubber, and plastics.)
p-s-v•1h ago
ceramic knives are great, but they are basically disposable because once they chip (they will) its incredibly difficult to sharpen them again.
LooseMarmoset•2h ago
As a knife-maker, may I request 80CRV, 1084, and 1075? They're very commonly-used steel grades in knives.

Also, 440 has a number of grades.

Cool tool!

EDIT: It might also be interesting to point out the manganese levels, and whether the steel is a deep- or shallow-hardening steel. Those factors help indicate whether the steel will form a hamon or not.

p-s-v•1h ago
yes, I will add this info.

thanks for the feedback

globular-toast•1h ago
Also maybe the steel that Wusthof uses, whatever it is. They don't seem to tell you what is, though.
williadc•1h ago
It's very likely 8cr13mov, which is listed
Zak•41m ago
Wüsthof prints the steel it uses on the blades of many of its knives: X50CrMoV15[0], which is also called 1.4116 and 5Cr15MoV.

It's not in OP's tool, but this article[1] by metallurgist Larrin Thomas includes it. His ratings are 2.5 for toughness, 2.5 for wear resistance, and 8 for corrosion resistance. It is a bad steel for any kind of knife and especially bad at Wüsthof's prices.

[0] https://zknives.com/knives/steels/steelgraph.php?nm=X50CrMoV...

[1] https://knifesteelnerds.com/2021/10/19/knife-steels-rated-by...

Retr0id•1h ago
> [Maybe attach the screenshot here if HN allows, or link to it]

I think the AI intended for you to edit out this part?

loloquwowndueo•1h ago
Shhh, I like those placeholders as dead giveaways that content was AI-produced. Don’t call too much attention to them or we’ll lose this way of identifying slop :)
FieryTransition•1h ago
I'm fine with ai slop if it provides value, the value here being questionable, because now I don't know if the values in the comparison are fact checked or hallucinations.
Retr0id•1h ago
I suspect they're hallucinated. As a random spot check: https://new.knife.day/item/spyderco-paramilitary-2

"The Spyderco Paramilitary 2 is a tactical knife with a 3.44 inch blade. The knife is made in USA of CPM S35VN steel."

It's a real knife, and the blade length checks out (to two significant figures), but the manufacturer spec sheet says S45VN steel. Also the actual name is "Para Military® 2".

https://www.spyderco.com/catalog/details/C81GS2/2090

p-s-v•1h ago
this data is mostly scraped from a few large knife retailers, so should be accurate.
Retr0id•1h ago
It's unusual for a large retailer to not use the official name of a product
p-s-v•46m ago
shrug, if you search around youll see that isnt true
shawn_w•21m ago
Not in this particular case. Out of the 5 knife retailers I just checked, 4 use Paramilitary in their listings. Only one included a space.
Koshcheiushko•1h ago
I thought, maybe OP had it in their draft for long and directly pasted it.
p-s-v•1h ago
hahah oops, i did use AI to produce this hacker news post :)
Retr0id•1h ago
Why?
p-s-v•1h ago
it writes a better summary than I can
dang•36m ago
(We've edited that bit out from the text above now.)
eichin•1h ago
Hmm, it feels like there'd be some interesting crossover between this and https://seattleultrasonics.com/pages/knife-database but while the "Quantified Knife Project" has a lot of numeric test-result data, it looks like they only have "marketing names" for the steel used (if you click through the links in the "model name" column for each knife.)

(Ah, the raw data is available https://github.com/seattleultrasonics/Quantified-Knife-Proje... has a "Blades" tab which might be enough to correlate.)

p-s-v•1h ago
thanks for sharing, i will check these out... previously was unaware of these
keisborg•1h ago
I looked through most of the charts, and I it seems like you cannot get the best of two worlds. Can you get good edge retention, ease of sharpening and toughness at the same time?

It would be nice with an example on how knife steel properties work. I assume there are balanced tradeoffs.

p-s-v•1h ago
that is correct, edge retention, ease of sharpening and toughness usually come at a trade off to one another.

A harder blade is more brittle (less tough) and keeps its edge longer... but is also more difficult to sharpen once it gets dull.... generally speaking.

Zak•2m ago
"Edge retention" is mostly achieved through high abrasion resistance. Sharpening is removing material by abrasion until the edge has a small radius, so ease of sharpening is mostly achieved through low abrasion resistance.

Being soft or brittle can also make forming a sharp edge difficult, requiring very light pressure in the final phases of sharpening to remove or avoid creating a burr in the case of softness, and to avoid chipping in the case of brittleness.

Of course all of these properties are affected by the heat treatment, which is often more important to the performance of the knife than the composition of the steel.

out-of-ideas•1h ago
comparison is kind of fun; i'd recommend keeping static colors per selection though (when toggling items, the change to colors of items already in the graph made it a bit annoying to decipher)
dvh•1h ago
So what do knife people think about outdoors55?
whalesalad•1h ago
Tangent: I had a decent benchmade griptilian folding knife for the last 10 or so years. Wasn’t the sharpest knife but I loved the form factor, grip, etc.

I left it on the bed cover of my truck the other day while unboxing some towing equipment in a parking lot and took off accidentally.

Looked at Amazon to replace it and they’re going for $200+ now. Is this just Amazon tax? Tarrifs? Something else? No way in hell I paid that for it initially. It was probably $50! It’s listed at $160 on their website right now.

Why?!?! It’s a simple plastic body and a small piece of steel. Make this make sense.

zikduruqe•45m ago
Television, survival, bushcraft, social media.

It used to be knowledge based survival skills, but today it is all gear based survival skills. Prices have gone crazy.

jerrac•42m ago
Look up the Ritter Houge, or something like that. I think it's a less (maybe) expensive version of the griptilian from the same designer. I think. Could be wrong.
shawn_w•30m ago
Benchmade has raised their prices over the years to the point where it's hard to justify most of their knives unless you're a big fan with disposable income.
williadc•1h ago
Sandvik 14c28n is common for budget knives. It would be nice to see it on this list.
antisthenes•1h ago
Obligatory link to the amazing blog about knife sharpness:

https://scienceofsharp.com/

hunter-gatherer•18m ago
Cool tool. I recently picked up a White River knife in CPM Magnacut. I could have used this tool when I was shopping around, but it looks like I landed on a good knife steel anyways. I haven't used it enougj yet to work on sharpening it though, so we'll see how that goes.
nntwozz•43s ago
[delayed]