Here's what to know about Pi Day and the history behind the holiday.Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day. Here's what to know.Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day, a commemoration of the mathematical sign Pi. That's because the date written numerically as 3/14 matches the first three digits of the never-ending number: 3.
His daughter, Sara Shaw, told ABC News her father was at a weekend work retreat when he came up with the idea to link March 14 with Pi's first three digits. Her parents told her that, several years after the first Pi Day, she was in elementary school when she realized March 14 is also Albert Einstein's birthday.
"Pi Day is such a special holiday for the Exploratorium," Samuel Sharkland, program developer at the museum, told ABC News. "It started off as a staff gathering and speaks to its magnetism and interest that it's blown up into an international celebration."