He's No Nird?

My mom used to think I was weird because I figured out a system where I could calculate what day of the week a given date was in a certain year. um, er, I think I've been beaten. I would be arrogant to even say that if you could quantify our weird abilities, that that little trick of mine would be the 13th route of his number-crunching powers. And I'm not even that good at it anymore.