Five Fascinating Facts about Pi

Some of the many ways that this fundamental constant of nature surprises us

Akira Haraguchi somewhere in the midst of reciting Pi to 100,000 decimal places from memory

The knowledge that a constant of nature exists in the geometry of circles has been around for more than 4000 years. The ancient Babylonians used to estimate the area of a circle by squaring its radius and multiplying their answer by three. Thus, the very first estimate of Pi was 3…