In 1978, Japanese engineers tried to build a small pyramid using ancient methods. They failed. 4,500 years earlier, Egyptians built the Great Pyramid. 2.3 million stones. No wheels. No iron. No computers. For centuries, no one could explain how. Then in 2014, scientists found the answer in a 4,000-year-old painting. Workers dragging a statue. One man pouring water onto the sand. Everyone assumed it was ritual. It wasn't. Wet sand reduces friction by 50 percent. The Egyptians didn't have our tech