Now. a team of Dutch scientists _ using wall drawings the ancients themselves made have come up with at least a partial solution: the Egyptians wet the sand in from of the stone sled as they pulled the stones into place.
Dry sand tends to clump up and stop the sled. But the Dutch teams found that if they wet the sand just enough, it reduces the friction and allowed the sleds to glide across the landscape.
Next up: discovering how the cat-worshiping Egyptians dealt with hairballs of the Nile.
Here’s the full article: http://www.livescience.com/45285-how-egyptians-moved-pyramid-stones.html