I firmly believe that scientific and mathematical concepts do not have to be as difficult as textbooks make them. Have a look about. I'm rewriting this site entirely, both to reflect its new purpose and to conform to web standards. Sadly, none of the major browsers fully support these standards, which is why a cursory look through the source code reveals all sorts of kludgy tables and positioning tags. In a perfect world, all formatting elements could be separated from the content.
Some browsers are better than others.
Accessibility issues need a little work.