It is the end of the Archaeology module and our field school students have learned a lot about how stone tools are made. Now it is time to put this knowledge into real use! Stone knapping is not just banging rocks against each other. It takes a lot of practice and experience. The seemingly “simple” tool of early Homo are actually pretty hard to make, especially if you are a beginner. We started by selecting a good set of tools: hammer stones and cores. Hammer stones are usually rounded in shape and relatively hard and dense in its physical property. The shape and consistency of a core is essential to making stone tools. Large and relatively flat stones usually serve as good cores to start with. Consistency is another important aspect of a core. It is difficult to control your flaking if there are preexisting fractures or weak spots in a core. Even if you have the best material, if you are not careful about how you strike the core, you may still end up wasting a lot of good material! A good stone knapper has to keep all these things in mind!