And so that period from about 10,000 years, starting with about 10, 15,000 years ago, depending on what part of the world you look at, is referred to as the Neolithic period. Neolithic, referring to new stone. And on top of this timeline, I have also shown what's happening at a very large scale climactically on the Earth. So these blue periods are Ice Ages, and these reddish-orange periods are the periods in between Ice Ages. And so you can see the last Ice Age ended roughly 15,000 years ago, and it began roughly 110,000 years ago. Now I'm giving you all this context about these Paleolithic, Neolithic, and the Ice Ages, because we're gonna talk about probably the most important series of events, or innovation, in all of human history, and that is agriculture. Agri-culture.