 Hi, I'm Evie Sevick from the Research School of Chemistry. Hi, I'm Joe Hope from the Research School of Physics and Engineering at A&U. And we're going to take you through light and waves. Why is a chemist taking us through waves and light in a physics course? Well, I mean, I'm more than just a chemist. I'm a scientist as are you. Science, physics, chemistry, it's all interconnected with science. So you can't separate all physics and chemistry from everything else. That's true. I guess I'm not just a physicist. I'm a scientist. I need to know plenty of chemistry to know how things work. Yes. Alright, so take it away, Evie, on waves and light. Okay.