One hundred thousand slaves tug multi-ton blocks across the desert. A complicated series of pulleys lifts each hand-cut stone into the perfect place. This is history's image of ancient Egyptian pyramid construction.
Several theories have cropped up over the years that suggest the pyramids might not be what they seem.
It is commonly believed that the pyramids are constructed of solid blocks of stone that were transported to the building site, however materials scientist Joseph Davidovits has suggested an alternative concept - that the Egyptians molded the blocks themselves from limestone and vegetable matter, a theory that x-ray diffraction data seems to support.
Source io9.com
