Rob,
Hi.
There is a difference between doing something and 'understanding' something. I have a friend who, some years ago, decided to go back and try to finish an engineering degree he had left sitting (in favor of another discipline). One evening I stoped by to see him and he was working some sort of advanced math. I commented that I never understood or could do that stuff. He commented back that he didn't understand it but he could do the problems.
Kinda like astral travel or dimensional shifting I suppose.
lol
Cheers (pangalactic gargle blasters to rinse away inter-dimensional dust)
RC