I also thought this was a scam like “energized water” and similar, but then found that there are actually medical studies being done on it: https://pmc.ncbi.nlm.nih.gov/articles/PMC10816294/ But that review paper also says, that larger sample sizes are needed and the mechanisms aren’t explained, so it may turn out useless after all.

Thanks to Crowdstrike I know that at least the checkouts in shops and some ATMs here use Windows 8 or newer, because of the new blue screen design (don’t remember if they had the QR code, which would mean at least Windows 10)

ARM boards with slotted RAM use the same type as x86 (although mostly LPDDR, as found in laptops), so I assume there isn’t any difference that is related to the CPU architecture.

My theory for why it created copies: The files you listed look like they are all subdirectories from /dev, which is (usually) a separate filesystem. When you try to move a file or directory across filesystems, the OS can’t just change the link, it has to actually copy the files and then remove the original. As a directory is a set of links to files, and the copies are different files, directories are just newly created with the same name in the new location instead of copying the directory filesystem entry. It looks like mv creates these target directories, before it checks if it actually has permission to remove the source, but checks file permissions, before it copies them

Regarding snapshots, I use a setup, where at the root of the btrfs partition I have the subvolumes “rootfs”, “home”, and a directory “snapshots”. I can boot into a snapshot by changing the mount options for the rootfs in the kernel command line, e.g.setting subvol=snapshots/rootfs-yyyy-mm-dd.

The only difference between a snapshot and a regular subvolume is that snapshots are readonly by default, you can keep a writable copy of a snapshot beside it for recovery purposes, if you need it. As long as nothing is written in it, it shouldn’t use any significant extra space.

Wouldn’t it still look weird because the two images are offset in a different axis than your eyes?