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kortex

8,442 karma · joined February 1, 2017

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kortex··on Munich court tells Netflix to stop using H.265 video coding to stream UHD
Maybe it's because I started as a chemist, where you look at patents all the time, but yes I've absolutely looked at patents for inspiration, to figure out how things work, to attack certain problems, etc.
kortex··on Vela incident (1979)
This is also the work that introduced the idea of the game theoretical focal point, aka Schelling point

https://en.m.wikipedia.org/wiki/Focal_point_(game_theory)

kortex··on Black goo is the new oscilloscope: Love Hultén's ferrofluid synths
I think like all things, it depends on the quality of the product. There are definitely cheap ferrofluids with mediocre surfactants that break down over time. But I also suspect (never looked, just inferring from the myriad of surfactants out there) that some formulations exist with way longer lifespans.
kortex··on The coolest robot I've ever built [video]
I actually think we are mostly on the right path, with the greatest exception being the current cost and overhead required to train the very best language models. But we are already seeing smaller, fine-tunable, user-deployable models.

I think (and hope) it'll track a similar trajectory to 3d printing:

1. Expensive systems only approachable to large corporations

2. Lower-cost but affordable as a business expense to cottage industry

3. Affordable to hobbyists, but requiring domain expertise to operate

4. COTS plug and play solutions for the wide audience

Right now we are at (1) with the huge scale LLMs, but scaled models are runnable by hobbyists (2-3) and we are at (4) when it comes to things like image generation and music splitting.

kortex··on The coolest robot I've ever built [video]
Just run SponsorBlock or similar then. If you still want to support creators, you can tune the plugin to only skip filler, or as I do, just prompt with a Skip button and I can choose to jump as needed.
kortex··on Light can make water evaporate without heat
You don't need monochromatic green light - that was just the test condition to find the best wavelength. Broad spectrum sunlight should do the trick.
kortex··on The slow death of authenticity in an attention economy
Great points. I think fundamentally you and I have different operating definitions of authenticity.

Though I do want to clarify

> The systemization of everything (through what you call "radical self-expression") is creating a bunch of pseudo-intellectual naval gazing

That's not my term, it's a burner term, and has nothing to do with systematization. The Ten Principles are a set of descriptive (not proscriptive) observations about what makes a Burn different from other festival-like gatherings [0].

> fundamentally a simple topic. Authentic people are honest people. You can often tell right away who is lying and who is not. The computer in your head has hundreds of thousands of years of evolution to help you with that.

This is probably the neurospicy rearing it's head. I understand what you mean about "fundamentally a simple topic". But in a lot of ways, it's not simple. To a first order approximation, yes "honesty about who you are" is tantamount to authenticity. Because for most folks, "who you are" is a fairly fixed concept, so being honest (or dishonest) about it is straightforward. But I don't think having a fixed concept of self is a universal experience. For me, (when I'm at my full potential) I'm able to select and deselect attributes of myself to express.

Tl;dr - "masking" making defining "authenticity" challenging for neurodivergent folks.

https://burningman.org/about/10-principles/

kortex··on The slow death of authenticity in an attention economy
Maybe this is my own neurospice speaking but...What even is authenticity? Do we even see authenticity in public? Any awareness that we are being observed introduces some amount of Hawthorne effect. Probably the most genuine folks are the introverts and socially averse.

Regional burns are espoused to celebrate "radical self-expression" , and unlike the Big Burn, their smaller size seems to promote authenticity to a greater degree. But even there, people are doing bits or acting out a persona or even just socially experimenting.

Authenticity itself is nebulous. But even taking that into account, there are definitely more harmful and less harmful facades. We pay actors and performers to be inauthentic. But we consider influencer "fake".

Point is, I don't think "authenticity" is the main metric we actually care about. Inauthenticity can be lots of fun for all parties. It's the motivations of the act. It's the second-order authenticity. An actor is authentic in their inauthenticity: there's no hiding that they are putting on an act. But we dislike influencers and the like because while they are (often obviously) inauthentic, they try to hide that fact under a facade trying to make it seem like it's their "real expression".

As a counterpoint, take a youtuber I really enjoy, Ryan McBeth. He does OSINT mostly military-themed current events vids and blogs. I'm sure the Ryan in front of the camera is different than the Ryan I'd meet at the bar: more polished, calculated in choice of words, presenting self in the best light, because that's what we all do in the limelight. But he totally lampshades his sponsored bits: "let me take a few moments to pay the bills". That's the second-order authenticity. Doing a paid sponsor bit is ipso facto inauthentic - it's not something you'd do without the influence of money. But lampshading it tips his hand and humanizes him. Or does it? <vsauce theme> Maybe he's saying that because his shtick is "down to earth authentic guy" and that's what that character would say? (I doubt it, but it's a fun hypothetical).

Famously, "All the world’s a stage, And all the men and women merely players" - Shakespeare

https://en.m.wikipedia.org/wiki/Hawthorne_effect

https://ryanmcbeth.substack.com/

kortex··on Finding that lead emissions from aircraft engines contribute to air pollution
Why are diesels so uncommon among piston aircraft, it's almost always avgas? Is it just "because that's how it's always been" or are there actual engineering reasons diesel are inferior? Cursory searching suggests it's mostly this inertia.

It'd be especially useful if they could run on regular jet fuel, then turboprops/jets and pistons could use the same fuel infra.

kortex··on Show HN: WebSession, a Secure Replacement for Cookies
A Bloom or cuckoo filter would allow for efficient tracking of nonces (depending if the security model prefers false positives with 4xx/resend, or false negatives)
kortex··on Show HN: WebSession, a Secure Replacement for Cookies
That interferes with the ability to send multiple requests in-flight at the same time.
kortex··on Bifrost: A peer-to-peer communications engine with pluggable transports
So implement your own Transport over UDP/QUIC?
kortex··on Progress on No-GIL CPython
Python's reference counting garbage collector would also need concurrency controls.
kortex··on Psytrance Guide
It's the intensity of it that strikes me. It's not just a matter of not liking their new stuff. I've encountered many folks that are basically mad the band changed directions. Almost as if the band owes it to the world to keep producing the same sound.
kortex··on Winsorized mean
My surface level take is they are similar to M-estimators. Whereas M-estimators are more mathematically rigorous, Windsorized metrics might be easier to compute manually.

It does feel like it's a very early 20th century technique. Nowadays we have so many tools which would be less feasible for calculators (the people) and more feasible for software.

https://en.m.wikipedia.org/wiki/M-estimator

kortex··on A 1990 experiment to test whether we could discern life on Earth remotely
Oxygen is an indicator of life, but not a strong one, as there are many processes which could create an oxygen atmosphere. What is a strong indicator is the presence of both oxidizing (oxygen, ozone) and reducing (hydrogen, methane, dimethyl sulfide) molecules, in sufficient quantities. That suggests something driving the equilibrium away from all-oxidizing or all-reducing atmospheres.
kortex··on Psytrance Guide
I don't understand why bands get so much animosity for "leaving their roots". IM make amazing, unique music and put on one hell of a live show. Is it as "pure" psytrance as Astral Projection et al? No but why does it have to be? They make music they like to make.
kortex··on Psytrance Guide
Not just electronic, but basically ALL genres on spotify:

https://everynoise.com/engenremap.html

kortex··on Psytrance Guide
> Many casual listeners cannot even detect such a small change in tempo.

I DJ both electronic formats as well as "general pop hits" nights. People may not consciously tell, but you take a well know track, and speed it up 3-5% (which also increases the pitch, unless you enable pitch-time stretch correction), and it injects a noticeable amount of energy into the dancefloor.

It's also just a social/"conformal" thing. Tempo regions serve as a kind of Schelling point for styles and energy levels. So if you have a given sub-style or vibe, you are likely to produce music in that style and speed, so it can readily mix in the same context.

Again, all of these micro-genres listed still fall under the aegis of "psytrance" and djs can and often do mix across boundaries and pitch stuff up/down as a part of their art. It's really about self-association and capturing specific vibes, vs exclusion or genre-policing.

kortex··on C Is Not a Low-level Language (2018)
Yep, this is a linguistic problem, not a technical one. "C is not a low level language" implies that the hi/lo boundary lies below C. What's below C? IR, Asm, and opcodes.

IRs like LLVMIR and various bytecodes. Well, those don't map to the hardware 1:1, not even close. So IR must be HLL.

Sure Asm has to be architecture specific, but even then we are getting pretty good at transpilation. And those codes get translated to opcodes anyways on most modern chips.

Basically, unless you are assembling on an ancient system or embedded processor, you aren't writing in a "low level language". Very few folks nowadays do this, so the term "LLL" doesn't occupy much mindshare in semantic space. That leads folks to populate it with what they perceive as low level - the lowest language on the abstraction tree they are likely to encounter - C.

This divide is only going to expand so I say we just accept the definition of low level language has shifted, and call anything where it does closely match... something else, I don't have a good term. Maybe "hardware level language".

kortex··on C Is Not a Low-level Language (2018)
The whole reason async is even a thing is due to slow, side-effect producing operations. Of course pure functions are easy to parallelize.

I don't think folks so much "shoe horn async where it is unnecessary" as the red/blue problem causes async code in most languages to spread.

Or by "async" do you just mean concurrent code? I'm reading "async" to mean lightweight coroutines or similar.

kortex··on Why you shouldn't join Y Combinator
Maybe a better analogy is nitromethane. If you put it in your honda civic, you will blow up your engine. You put it in a top-fuel dragster which cranks out thousands of hp and needs an engine rebuild after each race.
kortex··on Fair coins tend to land on the same side they started
Folks have made flipping machines than can achieve near perfect reliability. Same guy mentioned in the paper.

https://www.npr.org/2004/02/24/1697475/the-not-so-random-coi...

kortex··on USB inventor explains why the connector was not designed to be reversible (2019)
I did this once, it's not trivial. If you don't impedance match correctly, the colors get all wonky. It's a fairly specialized skill and more challenging than your typical solder job. Honestly easier to take the monitor apart and solder on a whole new cable.
kortex··on X confuses the masses by removing all details from links
That ever-so-slightly off-center rotation bothers me to a supreme degree... but I guess it's fitting for the whole platform writ large.
kortex··on An interactive intro to CRDTs
Have you heard about the Baader-Meinhoff phenomenon before? You will now.

https://en.m.wikipedia.org/wiki/Frequency_illusion

kortex··on Return to Office Is Bullshit and Everyone Knows It
I dabble in live audio. There's a huge amount that still could be done in the audio input space. Mic quality could be greatly increased for not much money, but most manufacturers stuff the cheapest component then can find into any headset <$150. Also, there's a lot which could be done with DSP (digital signal processing) before the mic even hits the computer.

You do see high quality mics and signal conditioning on the higher end systems, usually north of $250. And even then, it feels like that's a knock-on of paying for more headphone quality.

kortex··on Return to Office Is Bullshit and Everyone Knows It
My friend did the math for a high-falutin position at a San Fran tech company requiring 3 days a week in office, and flying from New York to Cali every week was cost competitive.
kortex··on Return to Office Is Bullshit and Everyone Knows It
Going from hybrid - pre-covid, and hiring as such - to 100% onsite is an asshole move and should be called out as such.

> apparent contradiction

I don't understand what you mean. Where's the contradiction? OP saying "never take an ultimatum" isn't absolute - there's an implied "in your best interest" there. If a cop tells you "freeze or I'll shoot!" do you ignore that ultimatum? Of course not, context matters. Obviously an H1B trying to support a family is going to most likely choose to comply with the ultimatum in the best interest of their quality of life. It's just unfortunate they have far less negotiation room.

kortex··on Tire dust makes up the majority of ocean microplastics
It's doubtful if you know even a basic bit of chemistry. Vulcanized rubber is a crosslinked thermoset polymer that is very difficult to break down, regardless of whether it is natural or synthetic in origin. It's going to produce roughly the same amount of microplastic per amount of tire. Lets say natural rubber lasts 2x as long, that's half as much microplastic, not 1/1000th. I get that GP is being hyperbolic, but natural rubber is incrementally better (at best) than synthetic, not revolutionarily better.
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