There aren’t many things that Congress can agree on, but in early 2009 it passed a bipartisan resolution designating March 14th of each year as “Pi Day.” Pi, the mathematical constant that students first encounter with the geometry of circles, equals about 3.14, hence its celebration on March 14. The math holiday had been a staple of geeks and teachers for years—festivities include eating pie the pastry while talking about pi the number—but dissent began to appear from an unexpected quarter: a vocal and growing minority of mathematicians who rally around the radical proposition that pi is wrong.
via Scientific American
