If you have read it yet, you may find The Case Against Travel interesting.

Life pro tip: While humans are indeed vulnerable to gamma rays from uranium, it’s usually all around more expedient to just hit 'em with it. And for that, many rocks will do, even just plain old feldspar.

This is a shitpost? Seems like a LPT as a useful, quick approximation, since the real formula is “subtract 32, divide by 9/5”. 30≈32, and 2≈9/5, as long as you’re figuring out what to wear for the day, not working in a chemistry lab. (Don’t burn your meth, fer gawdsakes!)

For 32°F, the approximation is 1°C, and even where the scales align at -40°, it works out to -35°C.