I'm a physicist studying nucleon structure. This is a field so complicated that other physicists typically shake their heads and mutter "must be mad". We typically work at several layers of abstraction.

This (Tangle) is the one tool that I've seen that is capable of communicating well to non-physicists what I do, without their needing to know Mathematica or C++ in detail. I really need to get around to writing a web page that does that. Awesome. Inspiring. Ridiculously, breathtakingly good. Bret's entire website is outstanding.