I don't think this is correct. The concentration of CO2 in air is about 0.04%, whereas the concentration of oxygen is 20%, so the partial pressure of oxygen is about 500x higher. This means that if, for example, 10% of the oxygen in a room spontaneously disappeared, it would be replaced about sqrt(500) = 22x faster through leaks in the room than a 10% spontaneous CO2 increase would dissipate. (This ignores a small effect due to the different density of the two gases).
So in practice the oxygen level can never drift meaningfully far from the atmospheric pressure, whereas carbon dioxide easily can because the pressures involved are so low.
Ok, fair points, including the sister comment, it's likely not a drop in O2 levels.
But then why can we see problems with concentration in studies of people in poorly ventilated rooms, but not replicate that when just adding CO2 to normal air? What is the CO2 that we can measure in meeting rooms actually a proxy for?
The Satish 2012 study that seems to have started this trend was a small cohort of 22 people split in 6 smaller groups where they also just injected pure CO2 in a small room. There have been several attempts to reproduce, which sometimes found no clear effect, or a significantly smaller effect.
This original study has been used to market these CO2 monitors for years, but the evidence is quite thin and doesn't support a strong effect. It seems likely that there is a small effect, and it has been wildly exaggerated thanks to a small study with N=22.
Can it not just be that what happens in stuffy meeting rooms is boring? Opening the windows changes the temperature, the noise levels, perhaps the light levels ≈ adds some novelty, which makes you feel a bit more awake.
I think this is (in turn) wrong. Yes: having 500x the amount of O2 as CO2 means that a 10% drop in O2 will trigger 500x as many molecules diffusing in per second as the same drop in CO2. But, each molecule of CO2 will change the relative percentage 500x as much as a molecule of O2, so isn't it a wash?
I use KOreader on my Kobo, which is an alternative open-source ebook renderer. It installs pretty easily without rooting the device. In addition to better standards compliance it also is a lot more performant and has niceties like auto cropping of PDFs.
A somewhat related experience: I asked for advice on Twitter about something and got two unhelpful AI-generated responses (from accounts I have never heard of / don’t follow) and no human responses. The thing is that I already asked multiple frontier AIs the same question and didn’t get a satisfying answer. I specifically went to Twitter because AI did not have the answers I was looking for. Providing an AI answer to a human question assumes that the asker hasn’t already done their homework and tried asking an AI.
I think VGT is a good QQQ replacement. It is based [1] on the MSCI US Investable Market Information Technology 25/50 Index which is free-float adjusted [2] [3], meaning that SpaceX will have a lower weight due to its lower free float. Also, VGT has a substantially lower expense ratio (9 bps / year [4]) than QQQ (18 bps / year [5]). You can compare VGT and QQQ's holdings on these pages [6] [7].
No it’s not. When the asset management industry says “information technology” they exclude the technology used for communication. That’s why VGT doesn’t invest in GOOG or META. AMZN is consumer discretionary so it’s also excluded.
That's fantastic. Thanks! I actually use QQQM which has lower fees. Seems like Invesco pulled a trick from marketing and segmented the market to have it both ways. I also need to find leveraged ETFs that have float adjusted weights which is a bit trickier. I might just pull out of TQQQ until the dust settles.
This reminds me of Vibe Kanban (https://vibekanban.com/) which I use to manage coding agents on most of my projects.
The Vibe Kanban developers unfortunately decided that they didn't see a path to profitability and have stopped investing in the project. It's open source and so you can run it locally / fork it, but it has stopped improving and there are still annoying bugs that need to be fixed (and I don't have time to maintain it personally). This makes me sad because I would be willing to pay for Vibe Kanban, but I didn't need the features their paid plan offered (in retrospect maybe I should have paid anyway).
I'll give Kanbots a go :) I'd recommend liberally copying features from Vibe Kanban. In particular the remote support and "Open in VS Code" button (which in my case opens a local VSCode client pointing to a remote VSCode server) are critical for me.
Vibe Kanban is indeed a treasure trove in terms of useful features.
I've been working for the last week or two on getting my new tool up to parity with VK with additional improvements. I've been posting some screenshots into the Vibe Kanban discord as well. Hopefully it'll be a great fit for your use case when I finally am ready to launch it.
(My tool aims for better features than VK in both the Kanban board and agent workspaces, while adding extra systems like desktop windowing, plugins, in-browser VSCode integration, and htmx-like server-rendered UI. The remote access also works differently - you host the whole thing like OpenClaw and access the remote desktop UI from the browser, rather than run a webserver on your laptop to access remote coding agents.)
You can also make ZIP files smaller by switching the compression from Deflate to Zstandard. In the one case I tried this, this resulted in a 60% file size decrease [1]. Unfortunately Info-ZIP which provides the unzip command hasn't had a release in 18 years, so it doesn't support this newer compression/decompression method. You have to use 7-Zip instead.
As far as I know, the ISO standard for zip only specifies two compression methods: "store" (no compression) and "deflate". If I follow that, when I create a zip file, I know it's not performant, but at least it's almost universal (except for file ownership, permissions, character encoding and anything modern).
The corporate PKWARE has added other compressions to their original zip software, but those are not in the standard. They will not work for an EPUB, a LibreOffice file, etc. If I want a good compression, I reach for zstd (often through `tar`) or 7z if I want more portability.
Oh thanks - I was waiting for a moment where I could turn up sound to watch the other video, but I didn't realise that that would set me back half an hour. This is the perfect amount of background for now!
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