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Thank you for that. Happy Monday after Thanksgiving. I hope you guys had a good break. We are back in action here on acids and bases, second lecture on acid and bases. Before we get into that, there's a celebration happening on Friday. You know that's why we're all feeling like a little extra goodness right now. Because we know there's a third midterm coming up Friday in this class, right? And that's nothing but excitement. Here's a concept map that I made for exam 3. This helps you sort of see the kinds of problems, right, that you could get, the topics that we've covered, and how it's all flowed and connected together, all right? So here are the quizzes. There's the optional one. Oh, you could still do it. So please, if you want to do the 8.5 and get that graded-- and then if it's higher than your lowest quiz, we'll swap it in for that. And you still get to drop one-- please do that and hand it in by tomorrow's recitation....

Happy Monday everyone! How you all doing? You  know it's good because it's a goodie bag day   and so I'll get to what you have in your hands in  this lecture. Today-- So we've been talking about   these things for a while now, right? We've built  up an understanding of the stamp and the basis,   and then we understood how to talk about it  like in terms of the planes and the symmetries,   and then we shined x-rays on it, and now we're  going to start taking them all apart. And so don't   be sad, don't be sad, because actually that's more  real-- that's more real. And that's what we'll   talk about today. So what our plan is-- you know--  So today we're going to start creating defects   in the perfect order that we've had so far. And  in your goody bag you have a defect generation   machine, which we'll talk about. And then on--  And so today we're gonna talk about one kind   of defe...

Happy Friday. How is everyone? Woo! Woo! Woo! Cool. Cool. I am excited. We're going to keep talking about XRD today. We're going to pick up where we left off. So I filled in some numbers. And then, we're going to fill out this chart and really get to a deep understanding of XRD. I'll also talk about Moseley's law and a little bit about another type of XRD that is done. Now, where were we? Oh, OK. We were here. So on Wednesday-- and before we fill this chart out, I want to go back and make sure we, kind of, get this. Right? We talked about the Bragg condition. And we talked about how the unique thing about x-rays is that their wavelengths are right in that, sort of, precious distance regime of the spacing of atoms in a crystal. And so if I shine them on the crystal, then they can diffract. And they can have constructive and destructive interference, but only if they line up. And that's what the Bragg diffraction tells us. It tells us the the Bragg c...