xkcd

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submitted 4 days ago by schnurrito@discuss.tchncs.de to c/xkcd@lemmy.world

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I have to pay with paper money.

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[–] zabadoh@ani.social 78 points 4 days ago (13 children)

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.

[–] thenextguy@lemmy.world 21 points 3 days ago (2 children)

Well, it certainly isn't made of sidewalk.

[–] zabadoh@ani.social 5 points 3 days ago (1 children)

Unless your sidewalks are made of gypsum.

[–] thenextguy@lemmy.world 7 points 3 days ago

If there are, they won't be for very long.

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