Flow Of History (Recommendation)

My ancient history teacher has brought his cause-and-effect teachings to the web at The Flow of History. Although there is a lot of simplification involved, I always loved the contextualization his flowcharts provided to whatever nugget of technology, social movement, or political operation we were trying to digest. It is nice to see that he's made all of his hard work available; imagine a world where all our teachers invested this much time and energy in their students.