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. For most of human history over this Paleolithic period, over most of this timeline going up until about 10,000 or 15,000 years ago, our ancestors were hunter-gatherers. They would have to chase the game wherever it might be. They couldn't settle down in one place.