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Using mud, clay, and tons of stone, ancient civilizations built buildings and monuments that are still standing today. The Egyptians built the Great Pyramid with an accurate measuring system, the ability to calculate areas and volumes of triangles, and a tremendous workforce that transported 1,000 tons of stone each day for 15 years. Other civilizations, such as the Romans, created marvels of engineering like the dome of the Pantheon, and built clean cities that included conveniences such as water management and sewers.
