TiddlyUniverse

Looking through the examples for TiddlyWiki below, I came across this site:

http://deferentialgeometry.org/

This is being put together by Garrett Lisi, the mad surfer theoretical physicist who is trying to demonstrate how all of the Standard Model and Gravity can be unified via E8. I won't try to explain what that is, mostly because I don't get it. Anyways, if you're feeling brave and happen to have a decent grounding in Lie Algebra, check it out. There are fun pictures too for those of us who thought that algebra could never lie...