Saturday marks Pi Day, the day to commemorate the mathematical concept of pi — which refers to the ratio of a circle's circumference to its diameter. Many math scientists and students around the world celebrate pi every March 14, as its first three digits are 3, 1 and 4.

The U. S. House of Representatives has even passed a resolution designating March 14 as National Pi Day.

Some say this year provides an even more auspicious occasion to ponder the enigmatic, endless sequence of numbers that make up pi. (Its decimal representation, which supercomputers have carried to 13 trillion digits, never ends and never falls into a repeating pattern.) Or it's another excuse to gorge on apple pies.