Without the Exploratorium, we might never have had an official Pi Day celebration. In 1988 Exploratorium physicist Larry Shaw started the tradition, and it was finally recognized by Congress in 2009. The Exploratorium highlights some great hands-on activities, and there is also a great list of Pi-related links.
History of Pi Day: 3.14. #HistoryOfTheHolidays http://billpetro.com/history-of-pi-day
OTHER PI HISTORY: Mathematicians all over the world began using the 16th letter in the Greek alphabet (Pi) in the early 1700's. Introduced in 1706 by William Jones but the symbol was not popularized until 1737 when a man the name of Leonhard Euler. Ancient Babylonians calculated the area of a circle by taking 3 times the square of its radius, which gave them a value of pi = 3. One Babylonian tablet dated from the year 1900–1680 BC indicated a value of 3.125 for Pi, which is a close…
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