Primitive saw is just a rope + sand + water. The problem was not to make things, ancients were able to produce few very advanced tools, mechanisms, and technol

Primitive saw is just a rope + sand + water. The problem was not to make things, ancients were able to produce few very advanced tools, mechanisms, and technologies, but to save them and pass knowledge of making them to future generations. To make a dent, you will need a tool for mass spreading of knowledge en masse: a church, a library, a copier, or a book making machine.