robryk @robryk@qoto.org

Ah, PSA: if you do actually collide with a bat, check very thoroughly whether (a) you got scratched in any way (b) you got your face in contact with the bat. If either happened, wash the scratch/your face thoroughly and urgently visit a doctor due to the risk of rabies.

I think I nearly collided with a bat today. I was riding a bike along Sihl just north of Sihlcity (the path is between a small forested hill and a river with a highway overpass over it; it's sparsely lit with streetlamps) and saw (~single frame only, because of timing wrt my blinking) a dark concave-sided diamond shape in front of me and felt a gust of wind.

It's not that surprising, given that a bit further north friends of mine would semi-regularly notice bats over the rive (and I did once or twice), but the near collision is surprising given my very predictable motion.

@Datterich @koteisaev @baldur

Note also the "Agnieszka" in the screenshotted list (it's a pretty common Polish first name, so I guess there is more than one Icelandic woman with it).

@GrahamDowns

Nearly first option, but I would never use it for cases when someone is _positively_ surprised and would use it for cases when someone is negatively surprised in a way that causes them to do nothing, even if not acting is a considered choice (as opposed to just a result of being shocked/confused/exposed to a very novel situation).

@timorl nie wszystkie zwierzęta są jak psy; niektóre też się pocą

@MyWoolyMastadon @stfn

Do solid tires differ noticeably in shock absorption from air-filled ones?

@oblomov @0xabad1dea isn't their service worse than a reply guy though? They are doing something underhandedly after all.

@wikiyu @brandon @stfn

Density (mass density) has little to do with leakage rates through small holes. That's controlled by viscosity and/or by mean free travel distance (the average distance molecule travels before colliding with another one) at different scales, and maybe by something related to interaction with the material the sides of the hole are made of. I think that for ideal gases that aren't adsorbed by the wall of the hole the only meaningful property is molecule diameter.

That said, see the sibling comment: it appears that these leaks are not through the valve but through the tube itself (as in, the tube's rubber is somewhat co2-permeable in a way I don't really understand).

@wikiyu @brandon @stfn

It has higher density: ideal gas (which air and co2 are well approximated by at room temperature and reasonable pressured) has the same number of moles per unit volume in the same pressure and temperature. CO2 has molecular mass of ~44, whereas nitrogen has one of ~28 (and oxygen ~32). So, the density of CO2 as a gas will be higher than that of air.

@brandon @stfn

A set of random people on the internet (after excluding ones that say things that can't be real) is reasonably unanimous in claiming that it's because co2 is in some way "soluble" in solid rubber. See e.g. https://www.madsci.org/posts/archives/may98/895552329.Ch.r.html

Thank you, I learned something new.

@brandon @stfn

Why can CO2 leak (I guess that's what you mean) through a valve easier than air?

@grimalkina

Which meaning of safe do you refer to? (Not risking some form of ostracism, having resources to do so without sacrificing more basic needs, not being prevented from seeing outcomes of your choices, or something still different?)

@rysiek

One thing that I'd dearly like to see is a separation between equivalents of MUA and MTA. In e-mail, your mail client actually operates on emails and not some abstraction level placed on top of emails by the MTA. This lack of separation contributes to whole fedi sending around only Create Note messages, because people cannot create any other messages. It also prevents people from viewing APub objects of nonpublic posts, because Mastodon doesn't expose an API where it would proxy a query to a remote server for you, but once again places its own abstractions over it.

I think this wish has something to do with the way Mastodon is developed, and would be more likely to come true in a world you describe. (I've seen Mastodon PRs assume ~unchallenged that Mastodon will interact with Mastodon only (or things that will try to emulate Mastodon exactly).)

Eh, why does the most recent #Sachgeschichte consequently use value and cost interchangeably~~~

@whitequark Because creating a fake agenda to present instead of the real one is harder (and thus rarer) than not presenting any and hiding the real one?

@steffo

I might be old fashioned, but concept of user statuses that are visible to ~all their contacts. For people who don't meet each other IRL all that often this is a way to notice that the other is involved in something that you'd want to talk about.