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How's everyone doing? [STUDENTS CHEERING] It's a goody bag. Thank you for that. It's a goody bag day. It's a good day. Related to the goody bags, once again-- hello. Once again, I want to get these out for you, because you got to have them on a Friday night. There's no real better way to think about spending your time on a Friday night than opening up a brand new goody bag. The topic of the goody bag is related to reactions, which is the topic we're starting today. But it's really also related to acids and bases, which is something we'll talk about on Monday. So I'm giving you the goody bag today, but I'll talk about the goody bag and contextualize it in the lecture on Monday. But as I said, today what we're going to do is we're going to start a new topic that we'll be talking about for the next couple of weeks. And that is the topic of reactions. And what we're going to talk about is reactions, OK? Now this falls un...

How's everyone doing? [APPLAUSE] Parents only, how are you doing? [APPLAUSE] How is it that the parents were louder than the kids? Kids, how are you guys doing? [APPLAUSE] All right. Welcome, parents. Welcome, parents. I'm really excited to have you here in class. This is 3091, Introduction to Solid State Chemistry. And today we're going to have a little bit of fun. As you can see, we got some activities. Now, the way I like to frame this-- are there any other seats? No, not so much. But make yourself comfortable. The way I like to frame this is you've got a lot of activities going on already. This is the parent weekend. So if we look at-- why is that happening? If we look at the-- oh, that's not good. OK, there we go. If we look at the MIT family weekend, there is activities. And so what I thought is that what we could do in this class-- we've got to learn a little bit. We're going to learn about x-rays today. But what I thought we could do is...