They had a season called the inundation, or the flooding of the river, which makes the soil fertile. They had a season of growth, which is now talking about the growth of the crops, and they have a season of harvest. And so you had people in this valley for thousands of years. But when we talk about ancient Egypt, we formally talk about it as a civilization around 3100, 3150 BCE. And this is where we get to our timeline right over here. So we're talking about right around there on our timeline. And the reason why this is considered the beginning of the ancient Egyptian civilization is this is when we believe that Upper and Lower Egypt were first united under the king, and there's different names used, Narmer, sometimes, or Menes, Menes.