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Researchers from the FOM Foundation and the University of Amsterdam have figured out how the ancient Egyptians transported huge stones across desert sands to build the famed pyramids. Egyptologists have been able to explain how the ancient Egyptians transported heavy cargo from the quarries to building sites using barges, but the question of moving the 2.5 ton stones across the desert has, until recently, plagued scientists and mechanical engineers alike. The research revealed that sand with just the right amount of moisture can double its stiffness.
Please note that gratuitous links to your site are viewed as spam and may result in removed comments. My family is from North Africa.They claim that the liquid used wasn't water,but clarified butter. If the 50 ton stones took 1 liter of water to move 1 feet (even though it sounds ridiculous) and all the stones were a mere 1 km away (even more ridiculous) then the water it would take to make an entire pyramid would be enough to fill 787 Olympic sized swimming pools.
Considering the watering, and constant heavy tamping, went on for so long, you'd think there has to be some sort of hardened path below the current surface.
Chris Dunn has proven that, utilizing today's technologies of quarrying the stones and using modern-day delivery methods would have taken 27 years! It is truly impressive how ancient civilizations discovered building techniques which were far superior to what we know from our (even recent) history.

I wonder about the possibility of having used some type of bitumen or crude oil from seeps or shallow well pools that may have been present long before drilling oil wells came along, like the tar pits in CA.. Well a fine idea on the surface, but where and how did they have enough water to go the distance?
And they still had to lift up the blocks and statues when they got them to the building sites! Through experiments and simulated desert conditions, scientists determined that the secret of moving heavy stones across the porous surface of the desert lies in the dampness of sand. Researchers at the University of Amsterdam conducted several experiments and concluded that the ancient Egyptians must have dampened the sand for the sleds-large slabs with upturned edges–to slide over it without it digging into the sand ahead. Thanks to microdroplets of water that bind grains of sand together through capillary action, friction and the force required to drag the sled are cut in half. Pyramids in Egypt are such a powerful memento of the rise and decline of great empires, something that is still important for the rulers of today.
I agree with previous comment that without some additive, the ability of sand to hold water at elevation is very limited. It is theoretically impossible to get 100% compaction on sand especially when 2.5 rock is pressing down on it.

An ancient artwork found within the tomb of the Middle Kingdom nomarch Djehutihotep confirms the new scientific findings. They could even build a frame around the stone- right in the quarry, mount massive wheels-sets to them. Furthermore, one of the reasons why Egyptian empire declined, was the climate change that turned big parts of their territory into a desert. The image includes a representation of a slave pouring liquid into the sand in front of the sled. Once the wheels were on, they could simply "cut the stone free" alleviating any need for cranes or hoists.
When at Giza, they could use sand as a temporary ramping surface that is built up between trips by another crew.

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