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المصري اليوم
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Source: المصري اليوم
18 Hrsالمصري اليوم
Source: المصري اليوم
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A study published in *PLOS ONE* has proposed that, around 4,700 years ago, the ancient Egyptians used a hydraulic system resembling an elevator to raise stones for the Step Pyramid of Djoser at Saqqara. The theory suggests that water lifted a floating platform carrying the blocks inside a shaft, with the help of ropes and pulleys. Water may have been gathered using ancient structures surrounding the pyramid.
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