Ancient aliens theory is grounded in a logical fallacy called argumentum ad ignorantiam, or “argument from ignorance.” The illogical reasoning goes like this: if there is no satisfactory terrestrial explanation for, say, the Nazca lines of Peru, the Easter Island statues or the Egyptian pyramids, then the theory that they were built by aliens from outer space must be true.

Whereas the talking heads of Ancient Aliens conjecture that ETs used “acoustic stone levitation” to build the pyramids, for example, archaeologists have discovered images demonstrating how tens of thousands of Egyptian workers employed wood sleds to move the stones along roads from the quarry to the site and then hauled them up gently sloping dirt ramps of an ever growing pyramid. Copper drills, chisels, saws and awls have been found in the rubble around the Great Pyramid of Giza, and the quarries are filled with half-finished blocks and broken tools that show how the Egyptians worked the stone. Conspicuously absent from the archaeological record are any artifacts more advanced than those known to be used in the third millennium B.C.