The Perfect Chalk

Chalk has been used by humans as a communication tool for thousands of years. Are some technologies too good to be replaced?

Image: contri via Flickr

Things mentioned in this podcast:
- 2015 article expounding the virtue of Hagoromo chalk (https://gizmodo.com/why-mathematicians-are-hoarding-this-special-type-of-ja-1711008881)

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