Why Mathematicians Are Hoarding This Special Type of Japanese Chalk
This spring, an 80-year-old Japanese chalk company went out of business. Nobody, perhaps, was as sad to see the company go as mathematicians who had become obsessed with Hagoromo Fulltouch Chalk, the so-called “Rolls Royce of chalk.”
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Posted on 2015-06-16T07:18:45+0000