 Hi, guys. We're back. So today's topic, we're going to begin looking at our very first tissue. And we're going to start out with epithelial tissue. In our next lecture, we're going to talk about connective tissue. And then we're going to see our other two kinds of tissues as we move through the course. Tissues, I have this. Hopefully this looks familiar to you. Tissues are a level of organization. And that's where I brought this along because I wanted to actually remind you that, oh, that's where we are focusing on. That's the level of organization where we're going to hang out for the next couple of days. And then, as we remember, these tissues can be used to build things. We're going to start building some organs and organ systems. So the first thing we're going to do in today's lecture is we're going to talk about tissues in general. And then we're going to focus in just on epithelial tissues, structure, function, how to identify them. We're going to look at some examples of what we might see in our lab. And finally, this lecture is like the glory lecture because there actually are some practice problems at the end of this, assuming you are accessing the lecture through Canvas and not on YouTube. After accessing it on YouTube, the practice problems don't upload. Okay, so let's get started. Let's talk about what tissues are.