Every year, math nerds and dessert enthusiasts unite to celebrate Pi Day on March 14, a date whose digits represent the first three digits of the mathematical constant pi. The holiday was created in 1988 by Larry Shaw, a physicist at the Exploratorium science museum in San Francisco. In school, you might have used it to calculate the area of a circle or the volume of a cylinder, but the applications of pi are endless and part of every corner of our world. Pi is involved in every step of aerospace engineering and is also on the cutting edge of medical research.