Read How a brand of chalk achieved cult status among mathematicians (CNN)
Hagoromo chalk has developed a cult following among mathematicians. When the company went out of business, chaos ensued.
I’ve read this same sort of article in other venues in the past, but closer to the revival of the company. This seems to have cropped up again because the original owner of the Japanese company has passed away in the last month.

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Chris Aldrich

I'm a biomedical and electrical engineer with interests in information theory, complexity, evolution, genetics, signal processing, theoretical mathematics, and big history. I'm also a talent manager-producer-publisher in the entertainment industry with expertise in representation, distribution, finance, production, content delivery, and new media.

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