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This is the story of chalk. Not just any chalk, but a Japanese brand called Hagoromo, which mathematician Satyan Devadoss dubbed "the Michael Jordan of chalk, the Rolls Royce of chalk" Then the company decided to stop making chalk. So mathematicians began hoarding it.pic.twitter.com/rzZ8wtTMjt
The last president of the Hagoromo chalk company, Takayasu Watanabe, talks about why he shut down his beloved product (poor health + plummeting demand–he was losing money on chalk) - so he shipped the machines to South Korea to keep the production going. https://asia.nikkei.com/Business/Hagoromo-president-explains-why-he-closed-down-his-beloved-chalk-business …pic.twitter.com/qLLjkWHtF4
Most Field Medals per capita in Mathematics 
(which is awarded to mathematicians under 40 years of age every four years) for large countries:
France 
has won 12 medals / 18.2 per capita (2.5 times median) vs 14 medals for USA 
/ 4.2 per capita (way below median of 7.22).pic.twitter.com/UWVbfTAaZA
Out of the 60 Field medals in mathematics awarded since 1936, 59 have gone to men. The sole female winner was Iranian-born Maryam Mirzakhani, a mathematics professor at Stanford University in California, who won it in 2014. She died in 2017 of breast cancer, at age 40.pic.twitter.com/n8NlZKL3sO
Chalk markings on a tennis court helped launched the McDonald’s innovative kitchen flow process that was copied by so many other industries (“lean manufacturing“). We don’t celebrate chalk enough.https://twitter.com/khanoisseur/status/1134504793655955461?s=21 …
Chalk is horrible stuff to use all day. From inhaling chalk dust to dust everywhere and drying out your hands through to that screeching noise it makes and snapping at inopportune moments, there's not much to recommend it. Try a whiteboard marker...
Use the Hagomoro chalk and you'll understand why people like it. It has a very thin epoxy-like coating that keeps the chalk off your hands and is thicker than American chalk so it doesn't break as easily.
I hated chalk and chalkboards so much.
Ironically, it was chalk and chalkboards that got me interested in science - I had teachers who adorned their boards with elaborate drawings and formulae and something about the way in which they’d use chalk as a flourish to end a theorem or a to make a point was mesmerizing.
Wish I had an idea for a product so good, people would hoard it!
Master mathematics and you could - good math underpins everything that is desirable! More battery efficient devices, algorithms that get you there faster, softer touch, harder materials - none of this would be possible without math.
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