Imagine being asked to pick a number from 1 to 10. You are quite likely to pick a whole number; I have never seen someone do otherwise. But you could also pick the number pi, whose decimal expansion ...

This article has been updated from the original post, which appeared on March 14, 2013. March 14, when written as 3/14, represents the first three digits of pi (π), the ratio of the circumference of a ...

Anyone who's had to learn math or physics in school may have encountered pi at one point. More popularly known and written out in its Greek lowercase letter counterpart, π, it's essentially the ratio ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...