Pi Day (March 14) is a day of global mathematical celebration, but it’s not the only numerically significant calendar date.

The progress and perfection of mathematics are intimately linked to the prosperity of the state,” said Napoleon Bonaparte, a ...

This is at least my ninth year of writing about Pi Day—here is my post from 2010. Of course it's called Pi Day because the date, 3/14, is similar to the first three digits of pi (3.1415 …). At this ...