Researchers have uncovered one of the key methods the Egyptians used to build the pyramids.

They have long been baffled by exactly how workers were able to transport large blocks of stone to construction sites.

Now, they say the key was simple - wet sand.

'For the construction of the pyramids, the ancient Egyptians had to transport heavy blocks of stone and large statues across the desert,' researchers at the University of Amsterdam said.

The team tried to replicate this - and found wet sand was the key.

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