How did ancient Egyptians stack those heavy stones of the oldest pyramid? Scientists float new theory

For years, experts have debated how the massive pyramids of ancient Egypt were built over 4,000 years ago. A team of engineers and geologists now proposes a new theory—an hydraulic lift device that used stored water to float heavy stones up through the middle of Egypt’s oldest pyramid. The Step Pyramid, built in the 27th century BC, remains a mystery due to its size and the weight of its stones. The new theory suggests the use of a water treatment system and a float to raise the stones. However, some Egyptologists remain skeptical and favor the widely believed theory of ramps and haulage devices.