Proponents of alternative history, confident in the fact that the ancient civilizations of the past possessed by some lost now in technology that allows them to maintain a relationship with the cosmos, to fly, to transmit ideas at a distance, etc., still consider the existence of perfectly round holes, which the Egyptians were doing in rocks and hard rocks, one of the strongest arguments in favor of the famous Egyptian pyramids were created if not by aliens from other worlds, then certainly using technology unknown to us.
When you work with hard rock ancient Egyptian artists and artisans used tools made of stone, including silicon and copper. Since the era of the New Kingdom (around 1550 BC), they began to make bronze tools, and later — the iron. Gemstones treated with copper drills and saws, and abrasives (e.g., silica sand) in large quantities.
When extraction of granite Aswan and its processing to create the building blocks, obelisks and sarcophagi of ancient masons used dolerite balls (dolerite — natural stone, which arose as a result of solidification of the magma rock, the main component of which is a basalt).
The original article from the journal "Science Illustrated" № 12 (2011)
See also: Scientists have found a mammoth Found ancestor of birds.