We're not going to have a lot of invasions and warfare because of that natural protection. But it's also going to make trade a little bit more difficult because you're not going to be able to cross those deserts 5, 6, 7,000 years ago. Now the Nile, unlike the Tigris and the Euphrates and other rivers in early civilizations, is predictable. Some of those other rivers would just flood whenever the time would be. But every July when the snow would melt in the mountains of Central Eastern Africa and the rain would come, the Nile would flood basically from July to October. So this kind of repeating pattern of flood, plant, harvest, flood, plant, harvest became the heartbeat of Egyptian society. It was dependable.