National Pi Day is tomorrow, according to ThinkGeek, and what better way to celebrate than by concocting a few Pi-Tinis. Or, you can just pick up one of these nifty Pi Symbol Ice Cube Trays ($8.99) — “perfect for simultaneously conveying your knowledge of mixed drinks and math” — for next year’s bash. Video after the break. Click here for first picture in gallery.

Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant pi (in the mm/dd date notation: 3/14); since 3, 1 and 4 are the first three digits of pi. March 14 is also the birthday of Albert Einstein and the two events are sometimes celebrated together.

[via ThinkGeekWiki]

[images via 1 | 2 | 3 | 4 | 5]