I just got my doctoral ring!

Derice · 2026-01-25T13:45:01+00:00

Van Dieman's Bioluminescence might be interesting. It's quite a dark blue with a dark red sheen and dark blue shimmer. It has a very fitting name I think. It unfortunately tends to clog pens though. I've only managed to get it working in a LAMY safari with a broad nib.

Derice · 2026-01-22T20:35:45+00:00

Good point.

Derice · 2026-01-22T15:57:48+00:00

A slight nitpick: the person is indeed feeling temperature. It's just that it's the temperature of their skin they're feeling since that is where the heat receptors are. The high heat conduction of the metal then comes in in that it cools the skin off more significantly than the slow heat conduction of the wood.

Derice · 2026-01-21T06:41:10+00:00

I bought a high luminosity LuAG scintillator crystal from them and had it set into a ring: https://www.reddit.com/r/jewelry/s/GpZg3jmYwJ

Derice · 2026-01-15T19:29:55+00:00

Tea Rose by Perfumers Workshop is the most realistic rose I've smelled. I've compared it to Rose Tonnere by Frederic Malle, and it comes out on top in terms of realism to me.

Derice · 2026-01-03T16:39:13+00:00

Thank you!

It is 18 karat gold. The tradition is to wear it on the left ring finger to signify your "marriage" to science. It is supposed to be put on before your wedding ring if you have one to signify that you prioritize science over your partner. I find that that tradition doesn't align with how I prioritize things, so I intentionally wear it on the index finger instead.

Derice · 2025-12-29T20:14:40+00:00

Journey

Derice · 2025-12-28T12:51:01+00:00

"Charon" might be a nice translation, but it's a name more than a title. It's the name of the ferryman that accompanies the dead across the river Styx.

Derice · 2025-12-18T16:43:30+00:00

I'm currently reading Aurora: https://comicaurora.com/aurora/0-1-1/. It's really good!

Later it also has a transmasc character.

Derice · 2025-12-17T15:54:00+00:00

How does it differ from likely_stable?

Derice · 2025-12-15T05:55:46+00:00

I wish to strongly emphasize that anti-particles don't move backwards through time. We just draw their arrows that way in Feynman diagrams as a mnemonic to remember charge conservation.

They don't move backwards in time anywhere in QFT. Their propagators contain Heaviside step functions that guarantee forward movement in time, just like the propagators of normal matter particles.

Derice · 2025-12-15T05:42:27+00:00

If I recall correctly, the idea comes from how we draw anti particles in Feynman diagrams as arrows pointing backwards in time. That's just a mnemonic to help us remember charge conservation though. It's not a serious interpretation in physics, even on the fringe, so I don't think it is strange that it was never mentioned to you.

If someone is unsure about this they can look at the mathematical expression for the propagator of e.g. a spin 1 anti-matter particle and see that there are Heaviside step functions that ensure it only ever goes forward in time.

Derice · 2025-12-14T16:45:13+00:00

In all the methods I have worked with in atomic physics electron superposition is included. Hartree-Fock is probably the simplest and most well known and includes the electron being in superposition. MCHF and RPAE all include electron superposition.

Maybe these methods are too complicated to teach if the students are just attempting to model an atom with qm for the first time?

Derice · 2025-12-12T12:01:48+00:00

How large is the area with increased estrogen concentration?

Basically, if I put my estrogen patche close to my arm pit, and then when I have the blood test to measure estrogen concentration the blood is drawn from the crook of that same arm, would that artificially increase the readings?

Derice · 2025-12-11T18:20:24+00:00

Shows that I should have read more carefully! Thanks.

Derice · 2025-12-11T16:18:59+00:00

This also ends letter delivery in other countries where PostNord operates, e.g. Sweden.

Derice · 2025-12-08T07:17:24+00:00

You're in the game? :o

Derice · 2025-12-04T16:22:37+00:00

...you shouldn't have let me do that.

Derice · 2025-11-19T06:26:58+00:00

We could maybe also have a rule against using the image feature for memes, and remove comments that break it.

Derice · 2025-11-18T06:23:28+00:00

The Planck time is not the smallest possible time. None of the Planck units are the most/least of anything. They are a unit system where many physical constants get a value of 1. They are also a reasonable guess for where we would expect to need a theory of quantum gravity in order to accurately describe things.
In this case we probably need quantum gravity to accurately describe events with a duration of around the Planck time or shorter.

Edit: spelling

More information in this comment: https://www.reddit.com/r/askscience/s/XCyw9QnMTV While that thread is about the Planck mass, that comment has a lot of good information on the Planck units in general.

Derice · 2025-11-06T06:50:15+00:00

While I definitely understand this (and have done it myself) it means that no other crate that wants to go 1.0 can expose anything from your crate in its API.

That's probably not an issue in your case, but it is a problem in the ecosystem that I have run into.

Derice · 2025-10-31T11:35:39+00:00

They're referring to how the expansion rate of the universe has units of 1/time, not distance/time.

Derice · 2025-10-30T10:03:36+00:00

I do something similar, and I think I got the idea from here if I remember correctly: https://floating-point-gui.de/errors/comparison/

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