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A comment on Mathematicians Are Hoarding a Type of Japanese Chalk. Parent comment

Re:Mathematicians Are Hoarding a Type of Japanese Chalk by ams6110 on Tuesday June 16, 2015 @11:42AM (#9726577)
There's also the occasional teeth-curling screech when a fingernail or little bit of hard matter in the chalk scratches the board. Even at that though, I think I prefer chalkboards.
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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by apricot on Tuesday June 16, 2015 @10:09PM (#9729758)
I teach math, and just as some people cannot taste the bitterness in Brussels sprouts, I'm not affected by the fingernail-on-blackboard noise. I find it very useful for taming a class of wild freshmen, though. I only have to do it once.

"It finds the correct delta or else it gets the noise again."

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