I really liked this, and will watch it again! It explains some of the mysteries of ancient times. They cover the Pyrimids and derive mathematical formulas and link it to other things. I like theories that explain the most things, and this does. It is somewhat limited as far as human history goes, but that is not the purpose. Consider the people of the times and the fact that few could read or write. Like Archimedes, it only takes one or two geniuses to figure things out, then they teach it to others, and sooner or later someone finds a practical use for it. Some sort of knowledge of ancient is very helpful. It takes about two watchings to think things out. and gives more ideas of what to look up next. If you have an inquiring mind, see this!