We know today, even if two observers observed something yesterday, something that just happened, they might have very, very different perceptions of what happened. So even if there's writing, we have to be skeptical. But things get, in some ways, even more interesting before we have writing, when we go into prehistory. You might wonder, how do we know anything about what happened if there's no written accounts? Well, that's where the science, and we get even more detective work. For example, this is a Neanderthal skull. And the type of people, the scientists that will study this, you'll hear terms like anthropologists, anthropologists, or anthropology.