In chronological order from the oldest to the newest the major developments in ancient Egypt ocurred like this:
1. the settlement of the Neolithic farmers 8000 BC
2. Tiles 5300 BC
3. the building of the Step Pyramid 3700 BC
4. the unification of Upper Egypt and Lower Egypt 3100 BC
5. the building of the Great Pyramid of Giza 2580 BC
6. the rise in the belief of life after death 1550 – 1070 BC
The answer is astronomer Galileo Galilei
