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In 1303 AD, the Great Pyramid of Giza was stripped of its smooth limestone shell. An engineer just used that exact date as a historical stopwatch. Alberto Donini measured the weathering on the newly exposed core blocks against the base stones that have sat uncovered since the beginning.

His math spits out an impossible timeline. 20,000 BCE.

That places the construction deep in the Paleolithic era, thousands of years before the rise of the Pharaohs. Mainstream archaeologists are heavily pushing back. They argue that Egypt’s climate has swung wildly between lush wetlands and hyper-arid desert over the millennia, making erosion rates totally unreliable. Established radiocarbon dating remains absolute. But the new measurements have thrown a wrench into traditional Egyptology, forcing scientists to defend exactly how we date the ancient world.