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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?

#291

Post by vpribish »

aaronbrethorst wrote: post #80

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…

do you have 10 plants per square-meter?

it's unlikely that you can add enough to make a big difference. plants are nice, but people often ascribe far more to them than is really happening - have you improved the ventilation too?

https://www.lung.org/blog/houseplants-dont-clean-air

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

#293

Post by Aachen »

eightys3v3n wrote: post #272
aaronbrethorst wrote: post #80

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…

Ikea makes a reasonably priced CO2 and 2.5 micrometer particle air quality monitor. https://www.ikea.com/global/en/newsroom/retail/the-new-smart... ALPSTUGA My house stays around 800-1000ppm CO2 all the time The HVAC is poorly designed in my opinion.

Checking it out locally, they go for 30€ here. That's cheap! I remember just a few years ago such products costing 80~100€ if you wanted it in a polished product (not a sensor from China, needing to write code to read it out). Is this a direct CO2 measurement, not one of these that uses VOC as a proxy measurement?

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

#294

Post by mitjam »

sdoering wrote: post #162
mitjam wrote: post #110

I'm exploring adding a firewall to my home network to detect if apps are using my network as residential proxy. My daughter likes to install random games on iOS that have been advertised to her on other apps, and I wonder if some of those work as residential proxy behind the scenes.

I once installed a private DNS with advertising block lists on a home network level. My SO was not amused, as her Android based games with "watch an advertisement for ingame credits" now did not work anymore. Nowadays only the TV sets and my own devices are set to use this (pihole) DNS server. So that I can at least watch Disney+ without ads.

Yes, I already run Pi-hole on a Raspberry Pi at home, but I had to disable it due to complaints.

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

#295

Post by Aachen »

numpad0 wrote: post #41

Surströmming, the Swedish can of fermented fish, is strongly recommended to be punctured while submerged in tap water. It is not pasteurized and is actively fermenting in storage, and the content will spray around if opened under atmospheric conditions. When transported on cargo flights, they are double packed as cans in a barrel in a crate, and considered UN classified "miscellaneous dangerous goods" with identifica…

I hope you didn't find that first paragraph out the hard way today!

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

#296

Post by 2ICofafireteam »

lanyard-textile wrote: post #281
ainiriand wrote: post #85

[flagged]

You'd think I'd feel differently having seven parrots, but you may be surprised to find I agree with you. To an extent anyway. I struggle with it. Don't bring a parrot into captivity from the wild. Separating them from the life they already know is cruel -- save for medical exceptions, after which you release them back. But it's already been done, and we have domesticated parrots. They are raised by humans, hand-fed…

"You become responsible, forever, for what you have tamed" - Antoine de Saint-Exupéry, The Little Prince

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

#297

Post by Aachen »

yjftsjthsd-h wrote: post #230
mindcrime wrote: post #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…

What's the advantage to systemctl --host foo status httpd.service vs ssh -t foo systemctl status httpd.service ?

Was wondering the same. "Do one thing and do it well" philosophy...

If I want to run remote commands, I know how to do that already (namely, as you've shown), why learn to use a new tool for it? It's like these options to tar for compression: if I want to have a gzipped tar I'll run the tar c /sdcard output through |gzip thank you very much! (and drop in zstd instead)

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

#298

Post by Aachen »

AdamN wrote: post #250

I used RfP (Request for Payment) today for the first time. It was ~11k USD between IBKR and Chase and the transfer was instant with verification on both sides. It's interesting to see the evolution of payments in the US moving so quickly over the past few years (FedNOW, etc...)

Wdym verification on both sides, did the recipient have to do anything? You can't just send money to an account number?

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

#299

Post by technothrasher »

I've been exploring making a camera trap to put out in my woods, to see if I can get a good photo of the very illusive bobcats we've got around here. I went out to California last month on a photo tour to get some nice shots of less skittish cats, and it gave me the motivation to continue my build of the camera trap. I just today received the custom little PCB I designed to read an IR sensor and have an STM32G convert it to focus and shutter release signals for the camera. I built the board up this morning and am getting ready to fire it up with my J-Link debugger probe attached and start the work on the firmware.
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