The funny thing is that this stuff I learned in highschool and I still remember it. However calculus, which I used throughout college, I barely remember at all.

I used to do Fourier and Laplace transforms in my sleep, and even worked on a fft program in assembler. Then a couple of months ago I couldn't find anything to take to the bathroom but a DSP book and it was like reading chinese. Something I pretty much majored in!!!!! :(

Alex