If you have been to Google today, you know that today is Pi Day. Today is 3/14 and Pi, the ratio of a circle's circumference to its diameter, starts with 3.14.
Pi is a special number in that it is irrational (it cannot be written as a ratio of whole numbers) and transcendental (it cannot be expressed as the result of any finite series of mathematical equations). Pi, written π, has been calculated to over a trillion digits, but if it could be written down, it would fill the entire universe.
To see one million digits of Pi, go here.
It's interesting to search for strings of digits in this list. So far, I've found the 6-digit birthdays of most of the people in my immediate family.