A moon pi. Okay, I'll stop. Let's talk about Pi Day. What are your plans? The value of pi (pronounced "pie") was first accurately approximated by one of the greatest mathematicians, Archimedes of Syracuse (yes, the guy in your Physics book who jumped out of the bathing tub and ran down the streets naked screaming "Eureka!"). The constant has been studied by humans for over 4000 years with the Babylonians and the ancient Egyptians being one of the earliest to do so. It was later in 1706 when William Jones baptized the value as the 16th Greek letter, π. However, Pi Day would not have ended up as part of pop culture if it weren't for physicist Lawrence N Shaw (a.k.a Prince of π). In 1988, Shaw noticed the link between March 14 and the first 3 digits of pi while working at Exploratorium, a museum of science, technology, and arts museum in San Francisco. Cue: the date format is 3/14 (mm/dd). A year later, the museum announced the day as a holiday and since then the celebration included serving pies at 1:59 PM (the next three digits that follow), pi shrines and more. Pi Day is now celebrated as an international holiday. Wow.