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https://en.wikipedia.org/wiki/Blackboard
http://www.todayifoundout.com/index.php/2015/05/blackboard-chalk-isnt-chalk/
http://www.madehow.com/Volume-1/Chalk.html
http://cameo.mfa.org/wiki/Blackboard_chalk
https://epod.usra.edu/blog/2009/10/sidewalk-chalk-and-the-calcium-cycle.html
https://gizmodo.com/blackboard-chalk-isn-t-really-chalk-at-all-1701961875
http://conferencechalk.com/how-is-chalk-made/
http://www.historyofpencils.com/writing-instruments-history/blackboard-chalk-and-whiteboard-pen-history-and-future/
https://kids.kiddle.co/Chalk
https://www.mentalfloss.com/article/552735/your-chalk-might-be-made-million-year-old-plankton-skeletons
https://ezinearticles.com/?What-Is-Blackboard-Chalk-Made-Of?&id=7267145
https://chip.web.ischool.illinois.edu/people/projects/timeline/1800keys.html