In the construction of the Egyptian pyramids, an artificial material similar to concrete was used. This material was recently created in the laboratory.
The resulting material has a very high strength, most likely because of it those ancient structures that, according to some theories, were made by extraterrestrial civilizations are so stable.
With the help of the latest technologies, the analysis of the stones from which the Cheops pyramid, as well as the Khafre pyramid, was made.
At the top of the pyramids, there are stones that, according to research, were made using human labor. At the bottom, the stones were created as if not from a human hand.
The stones at the top of the pyramids included palm ash, fine-grained sand, limestone material, and a special type of soda derived from Nile water.
It is believed that the concrete for the pyramids was made directly at the construction site and then lifted to the upper levels of the pyramid using buckets.
There, concrete, prepared using a special technology, was poured into special wooden molds to shape it into large bricks. These bricks are positioned in such a way that there is no gap between them.
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Laboratory experiments prove that this concrete hardens within ten days. Many tons of concrete were used to build the pyramids.
However, it is unclear why the lower part of the pyramids had to be built by an extraterrestrial civilization, and the upper one, which required more accuracy, by humans.