Today we, geeks, nerds and even common mortals are celebrating the square root day! So, what the hell is that? Very simple! A Square Root day (or SQRT day) occurs when the number of the day and the number of the month are strictly equal to the the number formed by the last two digits of the year number.

So, today it's day 3 of month 3 of 2009 year, which implies that:

sqrt(9) == 3 ; quod erat demonstrandum.

Be sure to celebrate, next one will happen in 2016. Cheers!