What Is Pi Day? 
What is so special about Pi and why does it get its own day every year on March 14th?
Sources:
https://www.exploratorium.edu/pi/history-of-pi
https://www.piday.org/pi-symbol/
http://archimedespalimpsest.org/about/history/archimedes.php
https://www.scientificamerican.com/article/what-is-pi-and-how-did-it-originate/
https://www.history.com/news/where-did-pi-day-come-from
https://thehomeschoolscientist.com/demonstrating-pi-string/ 
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