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user: BenjiWiebe (* users last updated on 10/04/2024)
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created: 2017-02-17 13:54:36
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about: Located in central Kansas. Work with cheese/neighborhood IT guy/hobby programmer. Born and raised on a dairy farm (and ~1/3 of the milk gets turned into cheese). Random qualifications: Amateur Extra (ham radio), volunteer firefighter in a very quiet area for 5+ years, Rubik's cube PB 19 seconds, can pick open an American Lock 1100 series if given enough time. Contact: itsme at (my HN username).com.


user: TeMPOraL (* users last updated on 10/04/2024)
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about: Just a programmer who likes to write games and hack Lisp code :). Currently earning a living with modern C++.

Contact me at hn@jacek.zlydach.pl.

(I mean it. Don't hesitate, I'm always happy to continue interesting conversations after their HN thread disappears off the front page.)

Homepage: http://jacek.zlydach.pl. More: https://keybase.io/temporal_pl.

I maintain a website with translations of pg's essays to polish language, http://esejepg.pl/.

I do software nowadays, but I'm constantly looking for opportunities to do something actually useful for humanity. If you know of some, please let me know - especially if they involve biotech, cleantech or NewSpace industry.

(see also: http://jacek.zlydach.pl/blog/2018-01-06-going-far-going-small.html)

--

Aw, what the hell, I want that extra badge:

https://hnbadges.netlify.app/?user=TeMPOraL

(see https://news.ycombinator.com/item?id=28389773)




Not as easy, no. OCR is needed if the PDF wasn't saved with embedded text/a document file.

Sounds like OCR is really the universal method. I'm guessing it shouldn't even be as hard as full-blown OCR, since you have access to fonts used, so you can render known characters as a reference and pretty much run a per-pixel matching on rendered PDF.

SDRs don't have the 800Mhz restrictions.

There's plenty of hardware tinkering around SDRs though.

The Newton Kansas Walmart has been out of a lot of stuff for a while. Like all the beans, rice, bread, sugar, flour, facial tissue, toilet paper, vitamin c, hand sanitizer, detergent, potatoes... They get stock daily, but within an hour or so it's cleaned out again. Definitely panic buying.

How long has the panic shopping been going on? In Poland, when it started, it cleared out the basic long shelf life goods (rice, pasta, etc.) and TP from most of the cheaper stores for about two to three days. For some reason, some kinds of meat also disappeared. But it seems to be going back to normal now.

If after couple of days your stores are still empty of most staples, it suggests some serious problems higher up in the supply chain.


Uplink commands are generally (always?) encrypted. He did have permission and access to the ground station and information.

I'd assume so. It's standard practice with space hardware to keep the downlink unencrypted, and secure just the command channel. Saves on complexity and power use (the latter matters a lot for satellites).

Several in my family were exposed to rabies via trying to save a rabid calf (before we knew it was rabies). We started the vaccination protocol ~3 days later. That was more than 2 years ago, and we are all fine. Definitely not only a 24hr window, thankfully. Was still pretty scary...

I've read somewhere about the case that took over a year, but can't find the link. Following citations on[0], this paper[1] says:

"The incubation period is typically 1–3 months, but can vary from a few days to more than 1 year [1,4]. Cases of up to 6 years incubation period have been discussed[5]."

And this is specifically in humans, not in animals in general.

There is no test that I know of, but vaccine is very effective even after you got it (but before actual symptoms show up), so if you suspect you're infected, you go and get the shots. Thing is, AFAIK those are quite painful, so it's not something you want to take as prophylaptic unless you're at high risk (e.g. working as a vet).

All this adds up to what I wrote earlier: you get random bat or squirrel bite, tiny enough that you forget about it in moments, and a few months later, you suddenly die.

--

[0] - https://en.wikipedia.org/wiki/Rabies

[1] - https://www.tandfonline.com/doi/full/10.1586/14760584.2015.1...


So I guess the diary should include a history of phone numbers. And maybe addresses to be safe.

I wonder about treating home address as such a secret. If someone wants to kill/kidnap me, they could always find me at my workplace or on a conference or sth. So what else are people going to do with my home address? Send me a postcard?

In the good ol' days, we had this thing called "a phonebook", which was basically a big printed book of alphabetically sorted mappings of surname to phone number and home address...


Citation needed on satellite signals being easy to jam. These satellites are moving rapidly across the sky, with directional (phased) antenna arrays tracking them. To have a good chance at jamming, your transmitter needs to remain in the path of the signal.

The antenna is already highly directional - those are LEO satellites we're talking about, you need to constantly track them.

How phased array antennas respond to jamming is unfortunately beyond my knowledge.


I'm 99% sure they meant no bandwidth restrictions per transmission within a band. You'd still have the rules about not causing interference etc.

They absolutely aren't considering letting amateur radio use all the spectrum.


> Amateurs currency have access to 420-450 MHz, an even larger band. If any of that were to be re-assigned, in theory it would be easier to get more channels or larger channels (there's no technical reason you could operate at 50kHz or 100kHz in that band, for example). Opening up even 2 MHz of spectrum could mean tens of thousands of additional stations could get on the air or new or existing licensees could get larger, faster channels.

I worry about slippery slope it would create. AFAIU, opening up those few MHz out of amateur band would let tens of thousands of commercial station to pop up... and the band would get crowded again, leading to pleads for the amateurs to release couple more MHz, until eventually amateurs are no more in this part of the spectrum.


Impressive. (Not you, D-Link) But seriously, why? Just why? I haven't even gotten a degree in security or anything, but I know better than to store a password in plaintext, at least!

To confuse password managers, obviously. :).

Citation needed on satellite signals being easy to jam. These satellites are moving rapidly across the sky, with directional (phased) antenna arrays tracking them. To have a good chance at jamming, your transmitter needs to remain in the path of the signal.

> Jammers (to my knowledge) operate by actively producing an inverted copy of the signals it actually sees.

No. Usually, all you need is to do is to send a signal - any signal - on a frequency you want to jam with enough power to overwhelm the target signal. A directional antenna won't get a milliwatt satellite signal if it starts picking up half a kilowatt of random noise, even if that noise is coming from the side. It's essentially a matter of how much power your jammer radiates and how high you can put it. Whether or not jamming interferes with other radio communication depends on how much of the spectrum your jamming signal covers.


Wouldn't two cameras and parallax show that the moon is a bit too far away to worry about?

Sort of, kind of, but not shot at the same time, and not at the same location.

I would object slightly less if they made a model (3D or AI) that captures the whole side of the Moon in high detail, and used that, combined with precise location and date/time, to guide resolving the blob in camera input into a high-resolution rendering *that matches, with high accuracy and precision, what the camera would actually see if it had better optics and sensor*. It still feels like faking things, but at least the goal would be to match reality as close as possible.


Yep, that's what I was meaning.

Yeah, that's what I meant.

Machines are amazing at counting things without losing their place. I'd trust an ATM's counted stack of bills over a human's (for sure if they only each got one try).

I've written some code at a previous job to simplify data entry. The previous method was adding numbers from a stack of papers, with a calculator. I trust my code to add up the numbers on the computer over a human reading them from a printout and entering them in a calculator.

Humans make mistakes. A lot.


And we should be able to do better with our technology, instead of throwing shit ton of compute at black boxes no one understands, hoping it will all somehow work out in the end.

And I'd argue that the need for manuals on Linux is greatly overstated.

This is no snipe at you personally, as I'm not yet all that good with it - but I'm surprised how nobody ever seems to read manuals for stuff, especially stuff they plan to use on a regular basis, and then live with problems that would never be an issue if they did read the instructions.

When I first realized this, I made a decision to always remember to RTFM, and I mean actually read it. Since then, it helped me in many ways. Some random examples:

- At one of my previous jobs, there was a proprietary source control / issue tracker / timesheeting system that the customer forced on us. Everyone absolutely hated it, considered it clunky and super confusing. One day by chance I realized there's an user manual in the Help menu, which I read end-to-end. And suddenly, I saw the system as easy to use, quite intuitive, and even somewhat likeable. Did wonders for my job satisfaction.

- My ability to use GDB went up an order of magnitude after I read the small book's worth of user manual it ships with. Ever since, I've learned to appreciate Info pages that come with GNU software, and prefer that to skimming man pages.

- When we bought our current car, my wife printed out the manual and I read that cover-to-cover too. Discovered a bunch of tiny little features we would've never thought to look for otherwise.

At this point, I consider the skill of reading a manual end-to-end to be my little superpower :). And I'm deeply disappointed when a product (be it physical or software) doesn't include a proper user's manual.


Obligatory xkcd https://xkcd.com/1357/

Also the mouse over text applies very well to this situation as well.


Relevant XKCD: https://xkcd.com/1447/.

The people who bring your food at Sonic do not make sure you've activated (removed) the coupon you told them you had. So you could use the coupon over and over...

It's funny when one day, you get to a place that tries to measure out the packets and even charge you for extra - and then another day you go to a McDonalds or KFC (the two where this happened to me more often), where if you mention you want extra ketchup, the cashier will just absent-mindedly pull half a dozen from some cupboard and dump them on your tray without even looking or counting.

BTW. it happened to me once with sauces - in a KFC, and we're talking about sauces they nominally charge for, that come in small, sealed plastic boxes. I mention I'd like some extra, and the cashier just asks me which ones, and then gives me a total of 6-8, no extra charge. To this day I don't know why they did it.


High powered model rocketry can and does exceed this.

No, but I think people see rockets as magic they aren't.

I think toy trains and real trains scale differently than "toy rockets". A home-made SRM is a more powerful version of fireworks SRMs, and then there's a thin line between home-made SRM design and things you could stack on car or helicopter to fire at things. Not every rocket is a space rocket, and depending on size and cost tradeoffs required, you get more and more complicated designs, creating a spectrum from a home-made 1km rocket to Falcon 9 & stuff.

I'd say that the real problem with rockets is not that they're inherently magical/difficult, but dangerous and costly to develop. We can say a lot about great engineering that went into things like fuel, nozzles, fins, etc. etd. but the same if not more engineering went into internal combustion engines, and I don't see people saying "it's combustion engine science".


There's bad performance hits coming from somewhere.

Very noticeable if you are like me and run an older smartphone (Galaxy S5, 2014).


I've felt it on my Samsung Galaxy S4, and on my SO's Samsung Galaxy S3. Both of which are high-quality devices, not some random el cheapo smartphones. Over the course of two-three years they both went from smooth&crisp to annoyingly laggy to (in case of S3) pretty much unusable even for making phone calls.

Now in this story I'm just an alchemist with no experimental controls, but then again, the experience is not isolated. I'm not saying it's purposeful software slowdowns - maybe it's general bloat + flash memory wearing out? I don't know. But seeing as others report similar cases too, something is going on.


Machines are amazing at counting things without losing their place. I'd trust an ATM's counted stack of bills over a human's (for sure if they only each got one try).

I've written some code at a previous job to simplify data entry. The previous method was adding numbers from a stack of papers, with a calculator. I trust my code to add up the numbers on the computer over a human reading them from a printout and entering them in a calculator.

Humans make mistakes. A lot.


Moreover: it's easy to trust each other if all you're doing is scientific research, games and pranks. But one day we woke up and found half of the world relying on computing in everything, from business to healthcare to national security. With regular people and regular day-to-day stuff comes regular crime.

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