How a brand of chalk achieved cult status among mathematicians(cnn.com)
cnn.com
How a brand of chalk achieved cult status among mathematicians
https://www.cnn.com/2020/08/22/us/hagoromo-chalk-great-big-story-trnd/index.html
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https://www.cnn.com/2020/08/22/us/hagoromo-chalk-great-big-story-trnd/index.html
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