And then from October to May, you have dry monsoons that are coming off the mountaintops, kind of bringing that dry wind across the plains. So farmers were able to figure out these patterns. And not only are they going to be the master of agriculture, but they're going to be able to master those rivers as well. And that's a very important feature, having access to water in that part of the world. You're also surrounded by mountains. It's nice to have mountains when you don't want to be invaded and such. So you have the Himalayan mountains to the north, you have the Hindu Kush mountains to the north, and you have the Karakoram mountains to the north, which is going to give you a very good wall of defense.