I don't think this lecture deserves five stars. It's not just an ordinary great lecture, it's a very good lecture, so it should have been given many more stars, but I can't give it more than the upper limit, so I'm sorry. I think Infraon should take note of this and come up with a special notation for this lecture. I'd like to cautiously suggest that the stars could be displayed in rainbow colors, or that one big star could be added on top of five stars. The reason for this suggestion is something you'll understand right away when you listen to the lecture. Most IT lectures only focus on 'how' to implement technology. Of course, this is essential knowledge in practice, but if you don't properly understand 'why' it should be implemented this way, it's difficult to remember, and it's even harder to apply. That's why I think lectures like this, which easily explain essential background knowledge and principles through analogies, are very excellent and valuable. I could feel the traces of the effort put into explaining things in a way that was easier for the students to understand throughout the lecture. Thank you for providing such an excellent lecture.