The pyramids: an enigma solved
Histoire
Braille avec transcription humaine
Résumé
For centuries people have presumed the pyramids were built by slaves working for years to move large blocks of stone into place. But was that possible given the lack of tools for cutting blocks and the high level of skill… required for fitting them together? The authors suggest that a desert chemical called natron was used to cast hard stones in much the way we now use concrete