What is Pi? If you measure the circumference of a perfect circle and divide that by the circle's diameter, you get π: 3.1415... It's like a never-ending long division problem!

Here's the first 10 of digits of Pi: 3.141592653

Check out how Princeton will be celebrating this year:

http://www.pidayprinceton.com/

Here are some weird videos about Pi - including an entire domino set-up of the symbol Pi and an Eminem rap about Pi!

http://www.piday.org/topics/videos/

Are you in Pi? Keeping in mind that Pi is an irrational number, which means it is non-terminating and non-repeating, check out this website that lets you type in your birthdate to see if it shows up somewhere in the number Pi.

http://www.mypiday.com/index.html

You might've heard that some people like to memorize the digits of Pi. Here is a website that keeps track of record-setting performances. Some people have been able to juggle while reciting the digits, some people can even recite some of the digits of Pi forwards and backwards, and others try to see how fast they can recite the digits. Can you believe there's a 3-year-old on this list who was able to recite 31 digits??!! How many digits do you know?

http://www.pi-world-ranking-list.com/index.php?page=lists&category=pi&sort=digits

There are lots of stories, poems, and songs written about the number Pi - check out this story that acts as a mnemonic for Pi. Can you see what the author did with the digits of Pi and his words?

http://wasi.org/PI/pipoem402.html

Do you want to write a song that matches the digits of Pi? Use this website to choose notes to represent each digit of Pi and the piano will play your masterpiece.

https://avoision.com/experiments/pi10k