Brien Foerster - Lost Ancient High Technology - Egypt Before The Pharaohs

Egyptian Culture as we know it i.e. hieroglyphic writing, animal gods, star-gazing, pyramids and temples, seemed to arrive out of nowhere ... 5,000 years or so ago.

how? how? how?

Before all that Dynastic Business, there appeared to be a High Technology Culture that needed no (crass or egotistical) grafitti in the name of any of the in-bred God-Kings and their warring escapades upon it. This was architecture that excelled in slabs up towards 200 tonnes and more; there's discussion of resonance functionality and softened sculpting/carving of stone/granites etc.
This video from Brien Foerster goes into the various examples of tube drilling, powered saws and mirror-like ninety-degree surfaces.