Maybe it can be safely burned?

Well if protection from solar heat is the goal, it will be hard to beat the “chrome dome” or reflective parasol. Sometimes the ground reflects quite a bit of heat from below, like snow. Then I guess a shirt might out-perform a parasol.

Google also says to put glue on your pizza.

It seems it’s still an active debate and area of research, but the answer is more complex than wavelengths and emissivity. If you want to know whether black or white is cooler in the sun, it depends on: the breathability or knit, the amount of UV hitting the skin, the amount of skin contact with the fabric, wind speed, relative humidity, how the fabric wets and wicks moisture, and more. We could look at a black trash bag and say, well it’s transparent to IR, and it blocks the visible spectrum, therefore it’s a good shirt material to keep one cool. And obviously that would be wrong. In the same way it’s wrong to say: a white shirt feels less hot when you touch it, therefore it keeps the wearer cooler.

Body emits infrared radiation. Sun does too. They make foil-lined jackets to reflect this heat. White shirts do it too, as shown in the image.

There are plenty of protected lanes in my city, but they just hide bicycles behind parked cars, making it less safe at every intersection.

The only way I can think that might work better would be to convert a 3-lane road (with suicide/turn lane in center), into a 2-lane road. The center lane gets converted into a two-way bicycle road - raised up like a sidewalk with curved curb. No left turns allowed for cars, only right turns. This way bicycles are visible and protected.

Body puts off heat too. White reflects it back, black lets it escape.

You mean xAI?

I am joking

Yeah it’s typically not used for dosages, rather it’s for concentrations in solution. However strictly speaking the grams cancel in the units of ng/kg and you are left with ppt. I think of ppm and ppt as very small percentages anyway. As per cent means part per one hundred. Can’t use “permille” because it means part per thousand but sounds like part per million.

In the case of a lethal dose, I think it would be fine to say, “it’s lethal at a rate of 2 trillionths of body mass”.

It’s possible to make a rasterized pdf - that would just be an image with specs for printing. I think teachers need to specify their expectations. Submit a plain text file? Submit a markdown document? Submit a Word doc? Is hand-written okay? What about a type-writer?

A pdf is just a digital version of paper, and since paper is obsolete, the pdf is probably a bit archaic for somebody who has no intention of printing it.

2.1 ppt (parts per trillion)

I learned to type from instant messaging: ICQ and AIM. I know I did Mavis Beacon too but that was the practice that solidified it.

Hopefully my rough estimate of 1995 was not too exclusive. I’m sure there’s not a hard cutoff, and the same goes for pre-1975. But being right in the middle of that range, it was pretty cool to use the full spectrum of PCs, and all the game consoles, and see the internet bloom and explode and decay.

Lol screenshot, pdf, what’s the difference really?

If you go 80 mph on the way there, and immediately turn around and go 60 mph on the way back, what is your average speed for the 160 mile trip?

I believe the most computer proficient people were born between 1975 and 1995. Before that and they were too old to figure it out without a lot of effort. After that they grew up with touch screens and it’s all just magic. Right in the middle we were able to grow along with advancements in computing.

I was teaching a class with mostly students born after 2000. One of them had never used a computer with a keyboard and mouse. Never used folders and files. Kind of blew me away.

It’s easy to restrict access. It’s hard to restrict access while letting search engines index your content, driving traffic. Maybe a local paper simply gets most of its traffic from the first paragraph summary, or local subscribers, so they don’t need to let Google index the whole article.

It’s explained pretty well in Optical Physics for Babies. Take a peek in the kids books section next time you’re at a book store. It also explains double rainbows, and why the second one has the colors in reverse order and is always more faint. This is a detail they got wrong in my favorite episode of Bluey: Rain.

Somebody has to make the call. There was this dinosaur book for kids in a little free library. It didn’t even have an author or publisher, because it was AI garbage. Full of misspellings, etc. I contemplated throwing it in the trash because I don’t think it should exist. But for some reason I had trouble deciding that for others.

Digitize and delete? Scan straight to OCR and dump the books. One hard drive can store a lot of books.