In the ninth book of the Small Series, the authors talk about the first and main wonder of the ancient world - the Egyptian pyramids. And also about the Scythian (that is, Russian) mounds, which are the closest relatives of the pyramids. It tells in detail about the famous mysteries of the Egyptian pyramids, what kind of structures they are and when they were actually built. It turns out that the main mystery of the pyramids is how they were built? - was already solved by chemist scientists not so long ago. But most Egyptologists pretend to know nothing about this. Most likely, they simply don’t want to hear anything in order to retain the right to tell old tales about how the pyramids were supposedly built in their opinion. This opinion is completely ridiculous, but it is the one that is heard everywhere today from the pages of “scientific” works and guidebooks, introduced into consciousness with the help of childishly naive documentaries and feature films about “ancient” Egypt, etc.?