Watch till the end to really understand. "To sum up, Nubia is Egypt's ancestor. What linked Ancient Egypt to the rest of the North African cultures (of that time) is this strong tie with the Nubian pastoral nomadic lifestyle, the same pastoral background commonly shared by most of the ancient Saharan and modern sub-Saharan societies. Thus, not only did Nubia have a prominent role in the origin of Ancient Egypt, it was also a key area for the origin of the entire African pastoral tradition." - Ma