Aliens seem to get a lot of credit from conspiracy theorists! Aliens didn't help build the Egyptian pyramids, even though the stones would have been difficult to move. In 2014, physicists from the University of Amsterdam dispelled rumors by putting a method found on an ancient tomb drawing to the test. They determined that the workers hauled the massive stone blocks on a sort of sled. By pouring water on sand or slippery clay as a type of lubricant, the workers reduced the friction of their path and drag the large blocks to construct the pyramids.