Perucchio said that if an architect tried to build the Pantheon today, the plans would be denied because without reinforcement, such as the steel bars commonly used in modern concrete structures, the dome would violate modern civil engineering code"The dome creates very high tensile stresses, yet it's been standing for 19 centuries," said Perucchio. "From this you can draw one of two conclusions: either gravity worked differently in Roman times; or there is knowledge that we have lost."



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