this post was submitted on 11 Apr 2025
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xkcd
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Sidewalk chalk isn't made of chalk anymore?
TIL: It's made of calcium sulfate, i.e. gypsum, the same stuff that goes into drywall, as opposed to calcium carbonate, i.e. rock chalk.
Congratulations you are one of the lucky Ten Thousand! https://xkcd.com/1053/
I guess count me in that 10,000 as well
Wow, so 20,000 people read this?
Lemmy's more popular than I thought.
I would say it's probably a lot less than ten thousand - I doubt this is something "everybody knows"
Well, it certainly isn't made of sidewalk.
Unless your sidewalks are made of gypsum.
If there are, they won't be for very long.
No wonder it doesn't taste good anymore.
It's not made of sidewalk anymore either