And there's many, many, many other techniques. And it isn't just about saying, oh, this skull was in this place in the world at this time. You can start to infer other things. You can look for fossils of the type of animals, the type of plants near these burial sites. You could see how dense these burial sites were, what type of cultures were there. You can start to make inferences. You can try to infer how these people died.