Janis Kenderdinehonestly, I didn't put "f(x)=x+x where x=2"
   together until just now myself :) - but then again, I learned to
   write in BASIC before I learned f(x) - and even then, I just
   'used it'.. never thought of it as the same thing as a function
   or subroutine - i just figured it was something 'different' to
   math :P "