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Ask HN: What did you find out or explore today?

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Re: Ask HN: What did you find out or explore today?

#181
It wasn't literally today, but about 2 days ago I discovered the -H (and --host) arguments to systemctl. These allow you to pass a hostname of a remote server, so you can use systemctl to manage systemd services on remote machines. It layers over ssh, so the cleanest way to do it is to have passwordless ssh with certificates set up to the remote host. If you do, running systemctl commands remotely is totally seamless.

https://www.tecmint.com/control-systemd-services-on-remote-l...

Re: Ask HN: What did you find out or explore today?

#182

My home office gets up to about 1500ppm of CO2 by the end of the workday, which explains a lot about why I often feel exhausted after the end of a long, uninterrupted session in there (especially when I’m on back to back zoom calls). I now have several plants in there that are supposed to be especially good at sucking up CO2, and my sensor reports that the current level is slightly below atmospheric ambient CO2 level…

I measured my office too, with an Adafruit SCD-30 sensor, it also got to 1500ppm faster than I expected. And it took a long time (12+ minutes with fully open windows) to get it down to an acceptable level again. Certainly compelled me to do that more often.

Surprisingly, i couldn't find any calculator or theoretical approach for estimating this (given room of a certain size, how long does gas need to equilibriate with outside atmospheric composition to within some tolerance, through a hole of certain size)

Re: Ask HN: What did you find out or explore today?

#184
post #170

My day just started but I found out that when I type a message in a MS Teams chat open in Chrome in Mac OS there are three separate independent spell checkers fighting to twist my meaning. Sorry, no positive news yet. But it's only noon.

I too am actively fighting the Teams spellcheck and autocorrect garbage. I can't seem to turn it off permanently, every time I log in again it switches itself on again. It refuses to understand that I speak multiple languages, and that no, I do not ever want this shitty tool to change words as I'm typing. Another classical case of MS not understanding consent, I guess?

> Another classical case of MS not understanding consent, I guess?

Not sure if Apple is better in this respect, with the "helpers" at least.

For MS, this job only switched to MS from Google less than a month ago but I could whine about new annoyances for 4-5 more paragraphs. And before using it, I thought Google is too enterprise oriented and getting in the way of getting work done. Compared to Slack. But not compared to MS.

Re: Ask HN: What did you find out or explore today?

#185

I got a handheld emulator console as a Christmas gift. Configuring shaders that emulate crt TVs, I realized I had no mental model of how those TVs worked at all. I’m used to “pixels are three little lights combining rgb colors”, which doesn’t work here, so I went on a rabbit hole and let me tell you, analog TVs are extremely impressive tech. Getting an electron beam to hit a glass, making the chemicals on it spark, c…

Don't forget how they found a way to squish closed caption information into analog broadcast. The electron beam traces a path on the CRT display by drawing the odd lines from top to bottom (which draws half the image) and then the even lines (the rest of the owl) from top to bottom. While the electron beam is repositioning itself from the bottom of the screen to the top of the screen, there is a brief period of time where other data can be transmitted. That's where closed caption data was shoehorned in.

Re: Ask HN: What did you find out or explore today?

#186

I got a handheld emulator console as a Christmas gift. Configuring shaders that emulate crt TVs, I realized I had no mental model of how those TVs worked at all. I’m used to “pixels are three little lights combining rgb colors”, which doesn’t work here, so I went on a rabbit hole and let me tell you, analog TVs are extremely impressive tech. Getting an electron beam to hit a glass, making the chemicals on it spark, c…

> Turns out that the logic in consoles of the time was tied to the speed of the beam, which in turn used alternating current’s frequency as a clock. This means that since European current changes 50 times per second rather than 60, our games played in slowmo (about 0.8x). American sonic was so much faster! And the music was so much more upbeat! Wasn't this the reason behind different versions of the game for PAL and…

>So I imagine the games would play quite similarly, just with a lower refresh rate in Europe?

That was my assumption as well! But nope, gameplay was coupled to framerate for a surprising range of years.

You can see comparisons on YouTube, check the music of the pal/ntsc version of sonic for the genesis/megadrive.

Apparently it was still happening to some extent during the PSX era. I remember the turn meter bars in FF7 filled very slow, and this explains it.

Re: Ask HN: What did you find out or explore today?

#187

I found out that reading 900 wpm and actually comprehending what you are reading is actually possible and not that difficult at all.

How did you discover this?

Might have been this thing:

https://v.redd.it/fpa35i6b97dg1/CMAF_1080.mp4

Re: Ask HN: What did you find out or explore today?

#189
post #122

[flagged]

"I always wonder why birds stay in the same place when they can fly anywhere on the earth. Then I ask myself the same question." - Harun Yahya

"Harun Yahya" aka Adnan Oktar the Turkish sex cult leader? Yeah he stays in the same place because he's serving 8658 years.
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