Lecturer: Hello, everyone, and welcome as part of this series of lectures on the development of early humans. Today we’re looking at rock art, the paintings, and drawings produced by prehistoric peoples as they spread across the continents. If you’ve been lucky enough to look at a piece of rock out close up, you’ll know it’s an experience that makes you wonder about the passage of time and our own history. But rock out also has a practical value for researchers, and let’s start by considering why that is. Firstly, it provides vital information about the way that people evolved information not always easily obtainable from excavated artifacts alone.