I suspect the problem, and why much knowledge like this came and went over the centuries, is that so few people understood the why and how of it that once the l

I suspect the problem, and why much knowledge like this came and went over the centuries, is that so few people understood the why and how of it that once the local guy who did was killed or died, the knowledge went with him and his books were recycled, lost, or destroyed because they appeared meaningless.