Not matter how you slice it, March 14 has something for everyone. The national holiday has been celebrated for decades now, since the late 1980s, thanks to a San Francisco physicist. Larry Shaw, also known as the “Prince of Pi,

This year, though, it comes with some twists that won’t be seen again for a century. Pi Day, celebrated on March 14 (3/14), honors the number π (approximately 3.14), which represents the ratio of a circle’s circumference to its diameter.