Inductor

Here’s a circular rainbow from an aircraft a skydiver:

EDIT: image embedding didn’t work

EDIT 2: not from a plane

EDIT 3: sorry for all the edits, fixed image

I’m not an expert, but I guess it would depend on the speed of sound in the rod.

They do, but compounding errors are always a problem with inertial navigation.

Instead of GPS, they can use fixed radio beacons like VOR and TACAN (which I think are both just US systems, but there are similar systems around the world and at major airports). This is basically the system that was in use before GPS.

EDIT: grammar

It automatically replies when it can read/summarize a site, but that isn’t always possible (maybe it has problems with some paywalls).

Replaying Death’s Door

I don’t know enough about the lemmy server to say whether this is a regular issue. I’d just retry creating a user with the same email.

Did it show an error when you tried to confirm your email?

I’d like to elaborate a bit on why DNS can be used to track you.

Nearly all web traffic is encrypted (https), you can check by looking at the padlock next to the URL in your browser. But DNS requests aren’t encrypted by default. This means anyone, most likely your ISP our the admin of your home network, can see what domains you’re accessing. That means just google.com, lemmy.world, etc. and not lemmy.world/post/… This isn’t a huge amount of info, but it does tell anyone who’s looking approximately what you’re doing (googling something, looking at lemmy, etc.).

To fix that there are a few different ways to encrypt DNS requests, the most common of which (afaik) is DNS over HTTPS, which will encrypt DNS requests like any other web request your browser makes. I don’t know why this hasn’t been made the default yet. Firefox has a setting for DNS over HTTPS, it calls it secure DNS.

Amateur radio/ham radio. There are a few ham radio communities on lemmy, but they’re all fairly inactive. I occasionally check on some groups on matrix as well.

The next few years are looking quite exciting for ham radio, because we’re reaching the peak of the 11 year solar cycle. This gives us amazing conditions for long range communication.

The referendum was (if I understand it correctly) about adding an advisory body of indigenous people to parliament. This wouldn’t have given them any power to make decisions, only to advise parliament on things.

The No Campaign just straight up lied to people saying it would let them write laws, take away your land, etc…

Yes, but it looks like it’s been inactive for a while:

[email protected]

Something similar happened last year. A company that made eye implants to help blind people see went bankrupt, and suddenly they weren’t around to repair/replace/remove the implants anymore.

Not necessarily, depending on how you’ve set it up, the bicycle has to connect to their servers to unlock. So if they shut down the servers, you can’t even use the pedals.

Here’s a video about it. (in German)

Did you know that every Apollo mission carried multiple rolls of ordinary duct tape with them.

It was used occasionally to fix broken things like the Apollo 17 moonbuggy.

They have radiators to dissipate heat. And all the required systems to make that work like coolant pumps, as well as heat sinks (or the coolant fluid is the heat sink).

But they also have heaters, to make sure that (especially the batteries) don’t freeze. Satellites hang in a delicate balance between freezing and overheating.

Flourine by itself is nothing compared to chlorine triflouride (CTF) though.

There were some ideas to use it in rockets, but, as John D. Clark put it:

It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water—with which it reacts explosively. It can be kept in some of the ordinary structural metals—steel, copper, aluminum, etc.—because of the formation of a thin film of insoluble metal fluoride that protects the bulk of the metal, just as the invisible coat of oxide on aluminum keeps it from burning up in the atmosphere. If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.

There were a few successful test fires with a CTF rocket on the ground, but to avoid explosions they had go through an elaborate multiple hour long cleaning procedure, and it ended up being too expensive and dangerous.