I was writing up my problem set answers once, and it involved the (complex analysis) residue. I wasn’t sure if there was a shortcut (as opposed to \mathrm); googling latex residue did not produce the search results I was hoping for…

This is obvious though — currently, you might test a drug on mice, then on primates, and finally on humans (as an example). It would be faster to skip the early bits and go straight to human testing.

…but that is very, very, very wrong. Science of course doesn’t care about right and wrong, nor does it care if you “believe” in it, which is the beautiful thing about science — so a scientifically sound experiment is a scientifically sound experiment regardless of ethical considerations. (Which does not mean we should be doing it of course!)

Now, taking a step back, maybe you’re right that, in the long run, throwing ethics out the window would actually slow things down, as it would (rightfully) cause backlash. But that’s getting into a whole “sociology of science” discussion.

This is all based, most likely, on Griffiths’ textbook. Quoting here from this post https://www.reddit.com/r/Physics/comments/1b97gt/magnetic_fields_do_no_work_but_magnetic_cranes/ :

The statement “magnetic fields do no work” is incorrect. Griffiths has mislead a generation of physics students on this. A correct version of the statement is that “magnetic fields do no work on objects with no magnetic moments” which is rather trivial. One could also correctly make the same statement about electric fields. However, electric monopoles are very common, so a situation in which there are no electric moments never occurs in normal circumstances.

tl;dr: use Jackson ;)

I can only remember this because I initially didn’t learn about xargs — so any time I need to loop over something I tend to use for var in $(cmd) instead of cmd | xargs. It’s more verbose but somewhat more flexible IMHO.

So I run loops a lot on the command line, not just in shell scripts.

I thought it was just “Slashdotted.”

I think mplayer has an ASCII output mode (VLC, too?), and I believe youtube-dl can output to stdout.

The rest is, as they say, left as an exercise to the reader.

Sounds like he was a mantis and was posting while copulating.

I switched from raspberry pi and orange pi to a cheap Intel NUC, and I think it’s just a much nicer experience.

The pi is great fun, but the HW transcoding on a NUC “just works,” and the SSD and 16GB RAM opens a lot of doors. My N100 NUC was less than $150, and it included everything (case, power supply, 500GB SSD).

My pi found new life as an off-site backup: attach a big HDD, set up WireGuard, and have a cronjob do daily rsync and snapshots. I have it set up at in-laws, and it works great.

I have one SSID with pihole (which I use), and one without. Works pretty well, if you’re ok with a VLAN-aware network.

Sounds like it was a 2 petawatt pulsed laser, with picosecond pulses, so 2kJ/pulse. Staggering amount of power and energy for a pulsed laser!

Note that it’s not CW, so the average power will be much, much, much less than the pulsed power. Too lazy to find the rep rate to see average power.

Remind me again, what color was Obama’s scandalous suit?

Although you can use case insensitive filesystems with Linux, and case sensitive filesystems with macOS. I believe the case sensitivity is a function of the specific filesystem — but yeah, practically, the root for Linux is always case sensitive, and APFS ain’t is only if you ask it to be ( https://support.apple.com/lv-lv/guide/disk-utility/dsku19ed921c/mac ).

No, that’s not really a useful way of modeling it for the case of light traveling through a linear medium.

The absorption/re-emission model implicitly localizes the photons, which is problematic — think about it in an uncertainty principle (or diffraction limit) picture: it implies that the momentum is highly uncertain, which means that the light would get absorbed but re-emitted in every direction, which doesn’t happen. So instead you can make arguments about it being a delocalized photon and being absorbed and re-emitted coherently across the material, but this isn’t really the same thing as the “ping pong balls stopping and starting again” model.

Another problem is to ask why the light doesn’t change color in a (linear) medium — because if it’s getting absorbed and re-emitted, and is not hitting a nice absorption line, why wouldn’t it change energy by exchanging with the environment/other degrees of freedom? (The answer is it does do this — it’s called Raman scattering, but that is generally a very weak effect.)

The absorption/emission picture does work for things like fluorescence. But Maxwell’s equations, the Schrödinger equation, QED — these are wave equations.

I kinda assumed any Mars mission would include some simple centrifugal pod. Seems like even if it’s just for sleeping it would be useful.

Dispersion and nonlinearities would like to have a word ;)

*in vacuo

I would bet that if you remux BBB to an mkv and play that through JF, it won’t transcode — I think it will just remux it back to mp4. Just a guess…

Interesting — I wonder if it only displays the first reason for having to mess with the stream, e.g., if it’s really that it’s an unsupported container, video, and audio codec.

Possible to try playing an h264 mkv (maybe Big Buck Bunny)? Since your screenshot is h265 I wonder if it indeed needs to transcode because that’s unsupported (in addition to mkv).

unless everyone is using hardware acceleration

I think that’s what (almost) everyone does. My little N100 works just fine with QSV.

Is it definitely transcoding? JF can remix without transcoding iirc.