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Scientists at a remote quarry in Egypt may have just uncovered conclusive proof of how the famous Giza plateau pyramids were built. How were over two-million blocks, each weighing 2.5 tons, lifted to the top of the 40-story monument?  The heated debate around the external ramp theory was the 10-degree incline needed to haul the blocks required a ramp bigger than the pyramid itself. Now, Egyptologist say the pyramid builders were able to pull the blocks up a steep 20-degree slope with the help of an ingenious leverage system.

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