In fact, human settlement, we believe, was along this Nile River Valley as far as 6,000 BCE, or 8,000 years ago. And it might have been there even further back in time. And because you had that agriculture, it allowed for higher population densities, which allowed for more specialization of labor and more complex societies. 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.