It’s Pi Day — a time to eat pie while celebrating a fundamental concept in mathematics and essential to fields such as science, engineering and art. The mathematical constant pi (π), which starts with 3.14, represents the ratio of a circle’s circumference to its diameter and is heralded on March 14. Notably, this day also marks the birthday of renowned physicist Albert Einstein, adding another layer of scientific and celebratory significance.

The first celebration of Pi Day occurred in 1988, when Larry Shaw, a physicist at the Exploratorium in San Francisco, California, sought to acknowledge the mathematical connection of March 14 to the first three digits of the constant. Since then, the arithmetic anniversary has incited celebrants to consume massive amounts of pie, participate in math challenges and laud Greek mathematician Archimedes, who is commonly credited with being the first to accurately calculate its value.

This year, interested elementary and high school students can undertake some pi-related problems posed by NASA. Or take the pi memorization challenge presented by the Exploratorium. Better have some pie to energize your brain before taking on this last task — researchers from the University of Eastern Switzerland recently assigned 62.8 trillion digits to pi.

Just don’t ask pi any questions. It will go on forever.