"These days are like calendar comets, you wait and wait and wait for them, then they brighten up your day - and poof - they're gone," said Ron Gordon, a Redwood City teacher who started a contest meant to get people excited about the event.
The winner gets $339 for having the biggest Square Root Day event.
Gordon's daughter even set up a Facebook page - one of a half-dozen or so dedicated to the holiday - and hundreds of people had signed up with plans to celebrate in some way. Celebrations are as varied: Some cut root vegetables into squares, others make food in the shape of a square root symbol.
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.