March 14th (3/14) is world Pi day.

Today, March 14th, the world is celebrating that most beautiful and useful of numbers - Pi! Come on in and join the party...

• Tom Körner celebrates (and calculates) Pi with cake
• Vi Hart will take you on a hunt for the works of Shakespeare in the digits of Pi (all in iambic pentameter!) and teach you how to Pi dance
• Alex Bellos has conducted the first ever interview in Pi-lish
• Peter Rowlett remembers the numbers of Pi past
• Numberphile explains Pi in sound, flammable sticks and bouncing balls
• You can discover the Pi Day Magic of James Grime and Brian Brushwood

Why are we all so excited? Well, Pi isn't just any normal number you know... or is it?

How are you going to celebrate Pi Day?