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https://kids.kiddle.co/Chalk#:~:text=Although%20traditionally%20composed%20of%20natural,larger%20sticks%20and%20often%20colored.
http://www.todayifoundout.com/index.php/2015/05/blackboard-chalk-isnt-chalk/
https://en.wikipedia.org/wiki/Blackboard
https://gizmodo.com/blackboard-chalk-isn-t-really-chalk-at-all-1701961875
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https://www.mentalfloss.com/article/552735/your-chalk-might-be-made-million-year-old-plankton-skeletons
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