But even when you have writing, it's not enough. As we'll see, not only in this video, but in many videos as we study history and world history, it's really a lot of science and a lot of detective work to make sense of what has happened. And that understanding will constantly evolve. For example, we didn't know what these hieroglyphs said until 1799 when we found the Rosetta Stone. And what was useful about the Rosetta Stone is that they had some text written in the hieroglyphs and they had the same text then written in a Greek that we were able to understand. And that started to help unlock what these hieroglyphs said. But even once you have a sense of what they say, and even if you understand it quite well, you still have to do a lot of detective work and take everything with a grain of salt.