Cherenkov light

“ultraviolet”, not infrared. IR to visible light would be upconversion.

https://en.wikipedia.org/wiki/Photon_upconversion

Oh, interesting. So do all neon colors reflect ultraviolet as visible light? Would a neon color that reflects IR as visible be possible? Or is it already figured out, but more expensive than UV neon paint?

Keyword recalling from a word in GP comment: photon downconversion is relatively easy and used widely, used in LEDs already, but upconversion require more exotic compounds and their efficiency is magnitude worse. Possible but not yet useful. It's certainly not like just using Lithium instead of Neon.

Perfectly viewable in Firefox, Edge and Safari. The problem must be on your side.

The link to the study is at the bottom of the article. It is Open Access as well.

Mobile safari was overwhelmed with ads with minuscule ‘close’ buttons within seconds of arriving.

It’s wild that it loads instantly and looks clean in mobile Safari with an ad blocker

Source: https://www.newyorker.com/cartoon/a16995

Side note, before you ask: yes, bra-ket notation is called like that because of the brackets.

https://en.wikipedia.org/wiki/Bra-ket_notation

“Die Zeit” (literally The Time) is a German newspaper, in case you were confused by the title.

“The books will stop working”, discussed 7 years ago:

https://news.ycombinator.com/item?id=20297331

Because they can.

Maybe you like this:

https://physicsopenlab.org/2020/10/10/a-simple-11-2-ghz-radi...

The HN discussion (2020) about this can be found there:

https://news.ycombinator.com/item?id=26078761

This one could be considered a classic but you might be one of today's lucky 10000 :)