The main problem I have w/ mastering perl is that I will occasionally go a month or two where I do nothing but perl, and then will go a month or two where I don't do any scripting (I am a *NIX SA). I find that after that month away, I have forgotten the stupid little things, like the syntax of a for loop. Geez, it's embarassing having to look things like that up.
As for math, it made no sense, until I learned it thru geophysics... go figger.
The eternal apprentice