I did lots of probability calculations today. Probability is such a useful thing to understand, and important to so many disciplines, that I'm surprised it's not taught more widely in highschool. I'm really glad I took Prof. Rota's probability course my senior year at MIT. (Although, most of the other students seemed to have had at least a little bit of exposure to it, so maybe it's just my secondary education that was totally lacking.)
Today's I-hate-java rant: whoever thought that we still needed to have both floats and doubles as a core part of the language needs to be beaten with a stick. There should be integers and non-integer numbers, and if anybody needs something more complicated, they should use a special package that lets them decide how many bytes of memory to use to represent each number. Compiler errors that claim no matching signature could be found because "0.2" is a double and not a float fill me with homicidal rage.