 And, as always, I have some study questions for you. There are a bunch of them for this lecture. Just as for lecture one, and you'll see for the forthcoming ones, these questions are focused very much on the simple fundamental knowledge. And as I described, those are things you need to know more or less by heart. And the reason you need to know them by heart is that when, in the next step, when you want to be able to reason and synthesize knowledge, you're going to use your by heart knowledge to be able to draw conclusions about much more complicated processes. And if you want to get there already now, I can strongly suggest that don't just go after a yes or no or a list item answer to what these are, but try to reason a little bit about them and think about what will that actually lead to. But that's all I had for you for this lecture.