We have seen the fascinating method of building the pyramids with water. But here is a new twist to it, water used in a rather different way. Researchers from the FOM Foundation working with the University of Amsterdam may have solved one of the mysteries surrounding how ancient Egyptians were able to build the pyramids without modern technology and equipment. According to the results of the study, ancient pyramid builders might have hauled huge, heavy stones over the desert sand by making the sand wet to reduce friction.