CNET reports that today is Square Root Day since the month and day (number 3) are both the square root of the year (09). The holiday is credited to a Redwood City teacher named Ron Gordon, and, according to the story, "celebrants are expected to mark the occasion by cutting root vegetables into squares or preparing other foods in the shape of the square root symbol." Get chopping those veggies today, folks, because the next Square Root Day isn't until April 4, 2016. The one after that: May 5, 2025.