I don't know about you, but I'm planning to celebrate by watching a "" marathon while playing with my slide rule. Remember, if you miss Tuesday's SRD, there won't be another one until April 4, 2016, and after that not until May 5, 2025.

Square Root Day is one of several numerically inspired holidays -- some real, others totally irrational.

Pi day has been since 1988, though it's sure to a bit more special seven years from now on 3.14.16. Suggested activities: Rent the film "Pi" while eating pizza pie, getting pie-eyed, and reading the .

If you miss Pi Day, you'll get a second chance to party on July 22, which is (22/7). This is also the birthday of French mathematician , who in 1792 devised a system powered by 90 human "computers" -- most of them former servants and hairdressers thrown out of work by the French Revolution -- to build a vast table of logarithms. The project took decades and was never completed. Talk about your government bailouts.

So much for the real holidays. To give the greeting cards industry a boost, I suggest adding these additional math days.