They're nomadic. They're looking for food. They're looking for wild berries. They're looking to live, right? But these changes that occur in the Neolithic revolution which we're going to go over next are going to cause the caveman to sit downeth. And once the caveman and the cavewoman sit downeth they have a chance to do a lot of things that are going to be revolutionary. So let's look at the causes of those changes.