A bunch of us have been working on understanding the physics of the Bussard Fusion Reactor. The subject of getting a copy of Mathematica has come up several times. What is detering us is the cost. Since I have several students in school and know several teachers from grade school to college level I may have a way around that.
In any case when I saw this lecture by Mathematica inventor Stephen Wolfram I couldn't resist. He explains why the universe we see is so complicated. The essense of it is: simple rules can lead to complicated results. It is inherent in the universe.
Get a copy of Maxima. It's open source and free. It's a great symbolic algebra system on *nix. It's also been ported to Windows and Mac OSX.