**HAPPY PI DAY: **March 14th (3.14) is

day and all around the world mathematicians are

celebrating this compelling and mysterious constant of Nature.

Pi appears in equations describing the orbits of planets, the colors of auroras, the structure of DNA. It's everywhere.

Humans have been

struggling to calculate

for thousands of years. Divide the circumference of a circle by its diameter; the ratio is

. Sounds simple, but the devil is in the digits. While the value of

is finite (a smidgen more than 3), the decimal number is infinitely long: