From the ‘today we’re all square‘ files:
Look at the calendar. Notice anything interesting? It’s the third day of the third month of 09. The square root of 9 is, yup 3 (remember grade 5 math?).
So Happy Square Root Day! This is something that doesn’t happen all that often.
The next Square Root day isn’t for another seven years on 4/4/16.
(and you thought 123456789 day was fun!)