We often find archaeological discoveries very attractive and a lot of them are about lost civilizations and cavemen eating each other in Eurasia or the Americas. In Africa, however, a lot of the archaeological material is from stone tools. Stone tools are a type of material culture of ancient populations that can go back millions of years ago. Stone tool technology is not just about different forms of tools, but about the brains behind those tools! By reconstructing the sequence of how a specific type of stone tools is made, we can interpret the amount of planning it requires for the ancient humans to make them. And not surprisingly, stone tool making went from simple to complex in the human evolutionary history. With Dr. Sonia Harmand, we learned different types of stone tools: what they look like and how they are made.