this post was submitted on 11 Apr 2025
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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/
Yeah... that's really not in the 1 in 10k catagory. Not even the 1 in 10 catagory.
i pretty sure those numbers are in reverse, at least if i understand you correctly. Its 1 in 10(lots of ppl know) then 1 in 10(less ppl know) and so on.
Nope. Not reversed. The guy I responded to thinks that almost everyone (9,999 out of 10,000) knows sidewalk chalk isn't made out of chalk. I'm saying it's not even as common as 9 out of 10 know that sidewalk chalk isn't made out of chalk.
In fact, I'd say the odds are more like 1 out of 2, at best. Possibly even that more people would give the wrong answer than the right one.
In that case, i think its the opposite