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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by kqr2 on Monday June 15, 2015 @11:08PM (#9723576)
OT, however, this made me think of Brandon Sanderson's book The Rithmatist where chalk and its formulation is an integral part of magic.

http://smile.amazon.com/Rithmatist-Brandon-Sanderson-ebook/d...

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