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Ancient Egyptians used wet sand to drag massive pyramid stones, say scientists

Apart from the great architecture, one question that long puzzled scientists is how Egyptians managed to move those colossal pyramid stones – some of which weigh several tons.

Researchers now suggest that the stones were dragged over wet sand. Their study, published in the journal Physical Review Letters and titled "Sliding Friction on Wet and Dry Sand", is based on a wall painting from the tomb of Djehutihotep, which depicts a person standing in front of a wooden sledge and wetting the sand.

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