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https://www.livescience.com/57106-why-fingernails-on-chalkboard-hurts.html
https://en.wikipedia.org/wiki/Chalkboard_scraping
https://www.newscientist.com/article/2123018-the-feeling-you-get-when-nails-scratch-a-blackboard-has-a-name/
https://www.themarysue.com/nails-chalkboard-ears/
https://www.npr.org/2011/11/09/142184389/why-nails-on-a-chalkboard-drives-us-crazy
https://www.popsci.com/science/article/2013-05/fyi-why-do-we-hate-sound-nails-chalkboard/
https://www.wired.com/2011/11/chalk-board-fingernail-sound/
https://abucketfullofscience.wordpress.com/2017/03/15/fingernails-on-a-chalkboard-if-you-shudder-heres-why/
https://factslegend.org/sound-of-nails-scratching-chalkboard-why-is-it-unpleasant/
https://adaa.org/learn-from-us/from-the-experts/blog-posts/consumer/misophonia-nails-chalkboard
https://www.nbcnews.com/healthmain/screech-sounds-which-are-worse-nails-chalkboard-1C6541925
https://www.reddit.com/r/explainlikeimfive/comments/1axkjo/eli5_why_do_sounds_like_nails_on_a_chalkboard/