Hacker News: dotancohen

New comment by dotancohen in "Show HN: Llmspeed – feel how fast a local LLM runs before you buy the hardware"

dotancohen — Sat, 17 Oct 2026 07:38:37 +0000

Tell us more about what your RX580 can do with the small Qwen models. What workflows are you doing, and what kind of performance are you seeing?

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 07:35:49 +0000

  > EU safety regs are pass/fail - there's no sources stating Tesla have exceeded anything there, they need to pass in order to be sold in Europe, so they've done whatever the minimum required is for that.

That falls under the purview of my phrasing "meet or exceed the absolute highest safety regulations in the US and in Europe". They meet European regulations and exceed US regulations.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 07:33:05 +0000

Maybe there should be a standard for that.

New comment by dotancohen in "Ultramarine 1 Flash"

dotancohen — Sat, 17 Oct 2026 06:56:11 +0000

Today I'd have the LLM write the script. Why not?

New comment by dotancohen in "Ultramarine 1 Flash"

dotancohen — Sat, 17 Oct 2026 05:08:44 +0000

That sounds more like a task for a python script than an LLM.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 05:05:41 +0000

That first video is terrific - but it demonstrates bringing the pressure vessel far beyond design limitations. Would you like to see what a tank of gasoline does when taken far outside design limitations?

The other two videos are triggered by the copv failing, but the explosion is due to the methane and lox.

My point still stands. The composite overwrap either survives a collision (crash tests will determine this) or doesn't (the vehicle will not be legal for sale in the US and Europe). The crash conditions are inside the design limitations, just like the batteries are and just like a standard fuel tank is.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 04:56:45 +0000

Work a BAC three times the legal limit as per TFA.

Billionaires drive Teslas? I must be in good company.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 04:53:09 +0000

Why drive at all?

Life is balancing risks. Do you drive an S-class? Why did you risk driving a less safe car?

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 04:51:07 +0000

And when opening from the non-stem end you get more of a handle, and there is less mass on the hanging peel. It's a win all around.

It's also a conversation maker (sometimes you're not party to that conversation) and gets you labeled at the office.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Sat, 17 Oct 2026 04:48:57 +0000

Better than the nipple?

New comment by dotancohen in "Tesla Roadster"

dotancohen — Fri, 16 Oct 2026 19:51:51 +0000

  > Tesla doesn't have a great record anyways.

If I'm not mistaken, and please somebody correct me if I am mistaken, Teslas meet or exceed the absolute highest safety regulations in the US and in Europe.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Fri, 16 Oct 2026 19:49:47 +0000

LPG explosions are real combustion due to tank rupture (often due to installation damage or rust). A nitrogen COPV can not rupture (that's why the CO in COPV is there) but it can leak. And that COPV, when it leaks, will be a rocket. But not an explosion.

10,000 PSI? That is beyond absurd. I can not imagine what alloy and how wrapped that pressure vessel is... Or what type of crazy pump is recharging it!

New comment by dotancohen in "Woman who rescued injured crow keeps getting 'thank-you gifts' from birds [video]"

dotancohen — Fri, 16 Oct 2026 13:19:53 +0000

I once met a woman named Bar. You guessed it, we met at a bar

Another girl I went out with during the same time period was Ifat - and yes, she was heavy set. Moran was actually quite bright, despite her name. Shiran actually did jog, and Hadass did have a nice figure. Tal was shorter than I expected, but Lital was bigger than I expected. Nofit, well, she had great legs at least.

New comment by dotancohen in "E Ink Kaleido 4"

dotancohen — Fri, 16 Oct 2026 13:08:38 +0000

  > That's not great for battery life.

Or for your eyes, which is one of the reasons people use these devices.

New comment by dotancohen in "Tesla Roadster"

dotancohen — Fri, 16 Oct 2026 07:10:02 +0000

Not to mention the mass. Perhaps the pressure vessels could be relatively lightweight, but a pump that could charge such a pressure vessel to the pressure and capacity needed for this type of stunt will not be lightweight.

And mass is one of the top engineering concerns for these types of performance vehicles, even those which do not need to fight gravity.

New comment by dotancohen in "E Ink Kaleido 4"

dotancohen — Thu, 15 Oct 2026 22:12:11 +0000

That's true for smaller readers such as the Kindle or B&N Nook - I've had half a dozen Nooks. Now I use a 10" Boox device. I love the thing, but only when it's on the table. It is too heavy and far too slippery to hold. I even stuck sticky plastic table covering onto the back of the thing to make it nicer to hold instead of the cold, slippery aluminium. But it's still far too heavy.

My next device will be no heavier than 200 grams, and will not have a metal backing.

New comment by dotancohen in "E Ink Kaleido 4"

dotancohen — Thu, 15 Oct 2026 22:07:27 +0000

I use a black and white Boox tablet, I absolutely love it. I've had it for almost four years. My workflow includes reviewing documents, I annotate heavily. I wish I had just some yellow or orange for highlighting.

A colleague has the colour version of the same tablet, with a Kaleido 3 screen. It's terrible. It's unusable indoors without the backlight.

New comment by dotancohen in "Phloem: Git history grown like a slime mold"

dotancohen — Wed, 14 Oct 2026 20:21:32 +0000

  > GitHub rate limit reached before anything loaded

New comment by dotancohen in "Solar panels that plug into your wall"

dotancohen — Tue, 13 Oct 2026 04:17:50 +0000

What country?

From where did you source the equipment?

New comment by dotancohen in "Hackers activate automatic defrosting in supermarket fridges across Europe"

dotancohen — Tue, 13 Oct 2026 04:12:29 +0000

  > it is standard security practices that monitoring and control must live in separate channels for security.

Was that the case 30 years ago when this equipment was designed, built, and installed?