It's not a coincidence that some of the first, that one of the first great civilizations emerged here. Now, our story of the Nile River, or of Egypt, and actually, they are tied very closely, even though Egypt is considered a lot of this region, most of the human population, this is true even today, is right along, is right along the river, around that fertile soil where the agriculture actually occurs. In fact, this was so important to the ancient Egyptians that their whole calendar, their seasons, were based on what the Nile River was doing. 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.