# Happy Pi Day 2013

It’s March 14 (3.14) and its Pi Day.

Pi Day is an annual celebration of $\pi$ the most popular mathematical constant. Larry Shaw of San Francisco Exploratorium led the first large celebration of Pi Day in 1988, and since then it has spread all  over the world.

Pi Pie (via Wikipedia)

To know more about $\pi$, you might want to read my posts about it.