Mathematicians are hoarding a special type of Japanese chalk (2015)

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.” He recently appeared on a Japanese TV special about the demise of Hagoromo Bungu Co., where a TV crew came out to Stanford to interview mathematicians about the legendary chalk. Here you can see a long discussion online where mathematicians are hunting for Hagoromo chalk suppliers in the U.S. Satyan Devadoss, a Williams College math professor, even wrote a blog post calling it “dream chalk.”

Source: gizmodo.com