Where did Pi Day originate?

Answer 1

Pi Day (March 14, a.k.a. 3.14, like the first three digits in pi) was first celebrated by the staff of the Exploratorium museum in San Francisco. In 1988, a member of the staff named Larry Shaw linked pi to March 14, and that first Pi Day was a subdued affair—a table of fruit pies and tea set up in the Exploratorium was the extent of the festivities.

Over the years, it grew to include a celebration of Albert Einstein (who’s birthday is conveniently also March 14) and a parade through the museum culminating at the “Pi Shrine.” Its popularity grew outside of the museum, and it became a national U.S. holiday in 2009.