What is Pi? Some might define it as the ratio of a circle's circumference divided by its diameter. Others might think it's an irrational number that's impossible to know completely. Still others might think it's a mystical, transcendental, almighty number that will only finally be revealed when society as a whole puts on a bunch of purple felt jump suits and hitches a ride on a nearby comet. Those people aren't reading this description though. They are browsing the howtothinklikeaflower.com website. But we digress… We here at ThinkGeek like to think of Pi as a way to help you come up with creative reasons to spend your hard earned cash on a T-shirt. Quick question. When is Pi day? March 14th of course. Think about that for a second. Now, while still mesmerized, drop this shirt into your shopping cart. Metro blue 100% cotton heavyweight t-shirt with the Pi symbol on it. The first 4493 digits of Pi were used to construct the Pi symbol itself. That's a whole lot of Pi. Enough for everybody to share so don't get greedy on us now. A big shout out from ThinkGeek goes to Archimedes way back in the B.C. for finally giving us a good approximation of Pi, and doing so without the benefit of modern trigonometry. And thanks to the Egyptians and Babylonians for trying.

When hosting the next soirée at your geek bachelor pad you'll need the proper equipment to ensure success. All three major gaming consoles, a flat screen over 40″ wide, a well trained dungeon master, a complete Star Wars action figure collection, and a fully stocked liquor cabinet are a must. But how about ice? You were planning to use that standard vaguely cubical stuff?… or worse the boring half-moon shape your fridge churns out? Well fear not intrepid nerdy party planner! ThinkGeek is here with the geekiest ice you'll ever find… Pi ice! Yep these stylish silicone ice trays cast frozen H2O into the symbol for your favorite irrational number. The chicks will swoon when you hand them a drink filled with Pi ice, and Archimedes will give you a big thumbs up for your tasty Pi Jello shots.

Pop Quiz, hotshot. Think back to a time when you were a young geek. Sure, you were brilliant at math, but being asked to solve problems on the chalkboard… That's the stuff of nightmares. Thankfully, that time is over… Or is it? The smell of chalk, and the feel of the blackboard is still fresh in your mind. If you close your eyes, you can almost feel the eyes staring at your back as you labor to engage your brain and simplify the polynomial. Can you feel your heart beat faster? Are your hands sweaty? Relax! This is just a clock! This lovely new timepiece appears to have been hand-written by that evil math teacher we all had to endure. Each hour is marked by a simple math problem. Solve it and solve the riddle of time. Or, you can just know that “52 – x2 + x = 10” happens to live in the “7 o'clock” position* and be done with it. * – Yes, we know that 52 – x2 + x = 10 allows for 7 and -6 as a possible answer, but since there is no such thing as -6 o'clock, the correct answer becomes glaringly obvious.