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roel_v

12,049 karma · joined January 21, 2010

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roel_v··on Sri Lanka’s ancient, almost lost martial art
"Bruce Lee's movie fighting style" then, which has little to do with his proper fight training, like Jean Claude van Damme's fight choreography has little to do with his fighting background.

Apart from that, I do take issue with the for some reason increasingly popular notion of Bruce Lee's fighthing being some sort of proto-MMA. MMA is not just taking something from various sources and calling it "<first name>-fu" or "<first name> tang doo". The essence of (old school) MMA/Vale Tudo is about finding out what works and what doesn't through literal trial by combat, it's not about the mix and match aspect.

roel_v··on Sri Lanka’s ancient, almost lost martial art
The reality is that most "martial arts" are mostly performative, as the principles of actually useful hand to hand combat are fairly universal and anything that isn't effective and efficient "evolves" out quickly. E.g. wildly flaying weapons, static Bruce Lee style kicking/punching only h2h fighting styles, etc. - spectacular for movies and demonstrations, but little use in actual fighting.

So anything that's "lost" is just as easily replaced by someone else coming up with another ritualized choreography.

Take aikido. Why are there so many people doing that? It's not because it has anything to do with actual fighting. It's like why panda bears are still alive - if it were to be left to nature, they'd die out soon, the main reason we have so many is because they look cute to humans and we protect and encourage their existence.

roel_v··on The humble water heater could be the savior of our energy infrastructure woes
Yes you need active ventilation systems, because the thermal efficiency is highly dependant on the house being airtight - to the point where efficiency scores are calculated by overpressuring the house (basically taping a huge fan into the front door with all other doors and windows shut) and measuring the pressure loss. When applying insulation, contractors have to meticulously use foam to seal everything up. It's a major part of the work when building a new house and just a few mistakes can seriously affect thermal performance.
roel_v··on WD My Book users wake up to find their data deleted
OK, well now come up with a formula that says (from a series of objective and not-readily-gameable characteristics) for a random electrical/electronic device (or, if you want to separate the two, provide a way to do so - is a 1980's microwave with an 8-bit controller for the timer 'electronics' or 'electrical'?) how long the warranty should be, how long it should be 'supported' (for a definition of 'supported') and how long critical errors should be fixed. Also specify which issues, and at which time point, should be paid for or not.

There is a lot of 'everything should be supported for eternity for free' in this thread, but I see no (at least somewhat) concrete suggestions for better solutions. If it was easy, we would have done it people.

roel_v··on WD My Book users wake up to find their data deleted
But consumer electronics are written off on much shorter timeframes than cars. Are we going to require support for electronics for 7 years? I would be in favor of it, but I don't see it happen. Device was EoL in 2015, the vuln is from 2019, breach 2021. Even if we take the vuln date, that's 4 years after EoL. The question then becomes: is it reasonable to say that electronics are expected to have a life half of that of cars? I could argue both ways on this.
roel_v··on Half of UK university students think degree is poor value for money
Additionally, in my (relatively) highly educated country (The Netherlands), selection for university starts in primary school, where about 20% is assigned ('given the advice of going to') to the type of secundary education that prepares students for university. So I think it's fair to estimate that a university education for 20% of the population is realistic, and I have no reason to believe this would be significantly (10 percent points higher or lower) elsewhere in the Union.
roel_v··on Half of UK university students think degree is poor value for money
Nonsense. https://ec.europa.eu/eurostat/statistics-explained/index.php... : 34% of the EU population 25-54 years old has completed education to ISCED levels 5-8, and level 5 isn't even university (depends on what you call 'university', but an academic bachelor's is level 6.)
roel_v··on ProPublica's tax story
"and the entertainment bill was huge"

Is that how it works though, 'even' in the US (where in my understanding there are a lot more options for deductions than in the European tax systems I have experience with)? Can you just deduct any expense that you can somehow however far fetched are connected to your investments? Usually once you start looking into the details, it turns out that it's not so outlandish as people (in the camp of the Pro Repulica piece, i.e. the 'tax others more' crowd) try to make it seem.

roel_v··on ProPublica's tax story
Why?

(if your answer is going to include some form of 'but housing is an essential requirement to live', be aware that my next question will be how to differentiate housing from food, or some other essential requirements to living, which are also left to the market to the chagrin of only the most hardcore communist)

roel_v··on Pandemic homeschoolers who are not going back
"They're both extremely well rounded adults now"

What do they do? Did they get any schooling after the GED's?

roel_v··on Ethereum will use around 99.95% less energy post merge
Maybe this is a good time and place to ask - let's say I want to buy something using Ethereum. Is it correct that when I look at, say, https://ycharts.com/indicators/ethereum_average_transaction_... , you have to pay USD 20 just as payment fees? I wrote off Bitcoin as a payment mechanism a long time ago because of this (although it seems BTC tx costs are now lower than ETH?), is this the direction tx costs for all crypto coins go?
roel_v··on Ask HN: Desperately need “sales for nerds” advice
I don't think what you're looking for is sales, but rather marketing. But if I'm wrong and you really are looking for sales, I learned a lot at what was basically a "hard selling" course. It was 3 days, the audience was basically people selling IT projects, but the background of the teacher and the roleplay we did was much more mundane - think selling cars, phones, that sort of 'sleazy' hard selling. I'm not saying you should actually employ those tactics in the end, but I did learn a lot - about cold openings, parrying objections, script-based interactions, ... You may just learn you're not cut out for it, but it'll help you a lot understanding sales guys if you decide to hire any later on. Mine was pricey - I didn't pay for it myself but I think it was e2500 per person and that was 10-ish years ago. On the other hand, how could I have trusted a teacher who couldn't sell himself to a purchasing department?
roel_v··on Hyundai Nexo sets new world record 887.5 km travelled on single tank of hydrogen
I live in a city center, no driveway. My neighbour with an electric i3 runs a charging cord across the sidewalk, I'm not going to do that, ever. I'd much prefer a hydrogen car I can fill up someplace else over requiring plugging in my car every day.
roel_v··on Legalese – Computational Law
This reads like it's something new, and maybe parts of it are, and probably any implementation will be 'new' in the sense that it uses recent technical innovations; but when I was in law school 10 years ago, I had a professor (with a chair in 'computational law' or something like that) who had been doing such things since the 1980's. Being a software developer in law school, I looked into his field quite a bit (there have been entire conferences on this topic since the 1980's) and there have been a lot of 'research projects' that explored various parts of what it seems this project is proposing; but none of them practical or big enough to make any impact. And, as usual in academia, it then dies off when the funding ends and the next cycle begins.

Anyway, I'm interested to see what will come out of this, but I see very little awareness of past work, which might be because they want to make it look more revolutionary than it is; or because they're reinventing the wheel. Time will tell.

roel_v··on Irish health service hit by cyber attack
It's easy to be healthy, just eat right, exercise more, sleep enough and lower your stress levels. Tadaa! The secret to being healthy!
roel_v··on Babel is used by millions, so why are we running out of money?
"Significantly above that salary, even in most of Europe."

LOL you're saying someone, in a rank and file (even if senior) developer position would be paid 'significantly above' $11k per month anywhere in Europe? This is a serious case of "citation needed".

roel_v··on Beyond Meat’s Beyond Burger life cycle assessment (2018)
Yes that's it, after some Googling it turns out that the word I had in mind is a regional word and the 'official' word is the literal translation into Dutch of 'head cheese'.
roel_v··on Beyond Meat’s Beyond Burger life cycle assessment (2018)
"I think it hilarious when people like me, urban dwellers, tell me to my face they only buy meat from some small butcher because they only trust him, or some variation of that story."

I bought half a pig some time ago; I have a copy of his (probably 'her'?) earmark here next to me on my desk. I get an invitation each year to go watch it when it goes out to pasture for the first time that year. I can choose to have the half delivered to me as a carcass, for me to do my own butchering, or I can choose to have it processed (and I can choose to give away the parts I'm not going to eat, like the blood sausage and the processed head, tails and ears (for which I don't know the English word - it's a grayish slab, often eaten on rye bread here in North-Western Europe; that is, when it's eaten at all, I don't know anyone under the age of 50 who eats it).

Anyway, my point is - it's very much possible to know exactly where meat comes from with small farmers/butchers, even for urban dwellers, to the point that I looked the animal that I ate a part of last night in its eyes several times.

roel_v··on California is not in drought
PSA for us Euros that instinctively ignored latimes.com links since blocking us when GDPR came into effect: they now let us in! Time to unlearn the reflex.
roel_v··on John Glenn popularized the word “glitch” (2019)
It's very common in gaming circles (not game dev afaik, just ppl who play games). I found it weird wording too, at first; it seemed like a euphemism for 'bug' to me, but I think I now have a more nuanced understanding. I think a 'glitch' (to people outside the software industry) is something that makes software behave in strange or 'wrong', unintended ways, but not crash or give straight up gibberish results. Like, a game crashing is a 'bug' but a character being transported across the map is a 'glitch'.

Likewise, if software rounds bank transfers to the nearest thousand $ and loses the remainder, but only on Thursdays when there is an 'r' in the month, then that's a glitch; but when the software doesn't open that's a 'bug' (or rather, 'it doesn't work').

It's an inconsequential difference from a software engineering pov, but in my experience it's major to outsiders, to the point where they start looking for workarounds for 'glitches' or explain things away, but throw their hands up at the first sign of a 'doesn't work'. I don't understand the thinking, but at least trying to understand users in similar circumstances has made me realize that there are things where I just can't understand someone else's point of view, in which case I need to switch problem solving or design methods; because no matter how hard I try, my 'how is that not obvious' approach isn't going to work.

roel_v··on How Tech Loses Out
The "How to make everything" YT channel (https://www.youtube.com/channel/UCfIqCzQJXvYj9ssCoHq327g) does that. He started from digging up clay with his bare hands to make pots, and is now roughly in the iron age IIRC, melting iron using only stuff from earlier 'tech tiers'.

One thing I found interesting is that apparently many metals used to be collected from ores just laying around. Those sites are all exhausted today. So a full 'reset' of the earth wouldn't be possible today. Of course metals could be scavenged from the machines we have now (in a nuclear disaster style scenario), but we could never fully 'redo' the technical evolution we did over the last 10's of k's of years.

roel_v··on Global electric vehicles sales grew 41% in 2020
Where are we on charging-from-underneath-the-car? I live in a city center, where I can't hook up to my own charging unit, curbside units are scarce and a pain in the ass having to plug in your car every time anyway (my neighbour's charging cable is always across the sidewalk, an accident waiting to happen, especially if more people would start doing this)

The obvious (to me) future is small-ish in-ground base stations in the center of all parking spots, with 'prongs' that come out and automatically plug into a car parked on top of it, presumably with some sort of communication between car and charging plate, and some way to 'guide' the prongs so that you don't have to park exactly in the right spot. There are technical challenges wrt reliability etc, but I wouldn't think those to be unsurmountable. Still I haven't heard of any advances in this field in years. Is that still happening or is manually plugging in the way of the future?

roel_v··on Employee accused of skipping work for 15 years
It's all over all sorts of EU media, I think in no small part fueled by 'remind me why we're giving Italy 222 BILLION euros in Covid recovery money when they spend it like this?' thinking. Which on the one hand is fair enough; on the other, articles like this coming out shows that you're trying to improve things. The general idea in the rest of Europe is that this sort of thing is rampant in the South, I don't know to what extent that is correct. Anecdotes online suggest that it's not a completely isolated incident, at the least.
roel_v··on Spanish police raid factory making 3D-printed weapons
Right, but a ghostgunner is not a CNC machine in the common meaning of that word. It was made specifically for cutting 80% lowers (even if the GG website claims it's a 'general purpose' CNC), and even then, only the lowers from GG themselves. And yes, there are initiatives like the GGFlex, but none of that takes away from the fact that it's vastly harder to machine a gun than it is to print one. Like, even with a GG you still need a premade barrel, FCG, magazine etc. In the US, you can buy those off the shelf (for now), but most places in the world you can't. Maybe someone some day will build a GG-like device that can cut all of those parts with the ease the GG can do it. But until then, there are 3d printed guns for those willing to take the risk.
roel_v··on Spanish police raid factory making 3D-printed weapons
In fact, my viewpoint is entirely Europe-centric. I know it's easy to order an 80% lower in the US. The whole point is that with 3d printers, even those in jurisdictions that don't have weird 'let's take one component of each type of gun and make only that regulated' laws can manufacture guns at home, with $500 worth of tools, and <$50 of materials. And no, you cannot whittle a Glock lower out of a block of plastic.

The vast majority of people in this thread are making vastly unsubstantiated claims. Claims that might have been true in the first years of the RepRap, but that certainly aren't true today. Please, before you post another reply, google 'FGC 9 Youtube', watch that, and then come back and tell me that that is not a massive shift in capabilities.

I'm not going to reply to the second part of your comment - if I'm understanding you correctly, you're saying 'yeah but if we didn't have 3d printing there would still be other ways of making guns.' May be, maybe not, I don't have a glass ball - but that's entirely besides the point. In the world we live in today, we have the internet, we have 3d printers, and in 5 years time we will have a situation in which every criminal and terrorist can make a small arsenal of firearms in a weekend, and at the same time, in most of the world, law-abiding citizens will have all their rights legislated away under false pretenses. And most people are perfectly fine with it, because 'guns are scary'. That is the real problem here.

roel_v··on Spanish police raid factory making 3D-printed weapons
Have you ever tried using a lathe or mill, CNC or not? I have, and I did some summer jobs in metal working businesses, and I can tell you that making a metal part vs 3d printing one is nothing alike. You need highly specialized skills to operate a mill or lathe, even on CNC ones (the skills are a bit different but it's not 'easier' to become a CNC operator than it is to become a manual lathe operator).

Becoming a sufficiently experienced 3d printer operator takes two weeks if you can spend an hour in the evenings tinkering with it, or a day if you spend a whole Saturday.

roel_v··on Spanish police raid factory making 3D-printed weapons
For a lathe, CNC or not, you need 10's of thousands of $ worth of equipment and specific skills and experience; several months worth, at the very least. Plus you need a space where you can put a workshop.

To 3d print a gun, you need a sub $200 3d printer, $50 worth of filament, a desk and a computer, and another $100 worth of tools to be able to ECM barrels in your bathtub.

If that is not a sensational leap in capabilities, I don't know what is. It the same leap as going from needing $50k Onyx workstations to being able to program advanced 3d applications with $500 worth of computing equipment and a bunch of free software from the internet.

roel_v··on Spanish police raid factory making 3D-printed weapons
The ignorance in this thread is mind-blowing. You most certainly can manufacture a reliable, semi-automatic, 9mm compact rifle where the only part that is not 3d-printed is the barrel and the springs. And even the barrel can be home-rifled using readily available tools from any hardware store, using 3d-printed jigs.

Now, the links you post look more like traditional Luty-style designs, albeit with some parts 3d-printed; still, regardless of whether this specific Spanish guy or the attacks in Germany used 3d-printed guns, 3d printed guns exist and you will see them show up in the news more often over the next few years. Brace yourself for the backlash, instead of closing your eyes, putting your fingers in your ears and singing "lalala you're all stupid, you can't print guns".

roel_v··on Spanish police raid factory making 3D-printed weapons
Well yes, but your original claim was that you cannot 3d print firearms, and you implied that 3d printers are not great tools that make it vastly easier to manufacture firearms by people who do not have years of metalworking experience. Both are (mostly) false. In other words, yes, 3d printers are a game changer when it comes to diy manufacturing of modern, semi-automatic (or even full auto) firearms.

(let's not get into pedantry here like 'I can stuff black powder into metal tubing and make a blunderbuss in a few hours! haha you can't stop me from making weapons!' While technically true, you're not going to rob a convenience store (or stop an invading army) with a diy black powder blunderbuss. What you can do with modern 3d printers gives home users without any experience in manufacturing anything pretty much equivalent capabilities of commercial gun manufacturers of, say, 60 to 80 years ago, which is enough to produce highly sophisticated weapons. True, you cannot make complex ejector mechanisms with lugs on bolts or Glock style firing mechanisms with 3d printers (yet), but you can most certainly make straight blowback guns that reliably fire medium power cartridges like the 9mm. In my eyes, that is a quantum leap in capability, and a game changer as far as law enforcement is concerned).

roel_v··on Spanish police raid factory making 3D-printed weapons
"Also you still need the lathe to turn a gun barrel"

No you don't, you can ECM rifling and a chamber, using 3d printed jigs.

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