Huffpost Science
A new study offers an answer to a key question about Egypt’s ancient pyramids, which were built out of huge stone blocks more than 4,000 years ago: in the absence of modern construction equipment, how exactly were the builders of the massive structures able to move the stones across the desert to the building site?
Researchers have long known that ancient Egyptians hauled the stones on sledges. But the scientists behind the new study say that to keep the sledges from sinking into the sand, the workers saturated the sand with water before moving the sledges — to form a more solid surface.
“The water forms liquid bridges that glue the sand grains together, as in a sandcastle,” study co-author Dr. Daniel Bonn, a professor of physics at the University of Amsterdam, told The Huffington Post in an email.
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James' World 2 
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