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

Re:Mathematicians Are Hoarding a Type of Japanese Chalk by ryanobjc on Monday June 15, 2015 @11:16PM (#9723601)
Someone pointed out that it's really hard to erase white boards. While it's trivial to erase a blackboard. Better for top secret stuff.
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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by innguest on Tuesday June 16, 2015 @12:29AM (#9723828)
Point them to this helpful link. :)

http://rumkin.com/reference/whiteboard/index.php

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