Answer:
Mathematics
Step-by-step explanation:
Considering the level of scientific development that most societies possess at that time, Building the Pyramids cemented ancient Egyptians as one of the most mathematically advanced civilization in history. The structure of the building require profound knowledge in Geometry that can't be found in other societies during that era.
Historians also noticed the same level of mathematical advancement in the way ancient Egyptians build their irrigation system. They managed to invent the pathway to relocate water from rivers to agricultural fields that located far away from the source.