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. The end of the Stone Age, the Old Stone Age, the Paleolithic Age, and the beginning of the Neolithic Age. And again the years fluctuate but a good round number if you're taking notes is about 10,000 before the Common Era, BCE, before the year zero. Are you ready for some causes?