Okay, I'm not a math buff, but I do love useless trivia - so, happy square root day!
Square root day only occurs nine times each century - falling today - Tuesday, 3/3/09 (for the mathematically challenged, three is the square root of nine).
The last such day was five years ago, Feb. 2, 2004, which coincided with Groundhog Day. The next is seven years away, on April 4, 2016.
10 hours ago