 Hi, I'm Charlotte, and I'm here to talk about artificial intelligence. Did you know that computer systems build representations of the world and then perform reasoning on them? A representation is a way to describe a system using the relevant features. Think of a subway map. We don't show the trees and the cross streets, we only show where the subway can stop. And we apply reasoning to that by planning your route, figuring out where you need to go to get from MIT to the Red Sox game, red line to green line. An AI system uses computer vision to construct a representation and then performs reasoning on that that are choices within that representation. For example, the Cosmo Robot. The robot has computer vision and can identify things like blocks, it can identify you by name, it can identify your dog or your cat, and it knows where it is on the table. Then it can perform reasoning such as picking up a block, saying your name, or playing a game with you. You can also have representations of things that don't see, like the Bach Bot or Google Doodle where you can play with music. There are features in this music. Those features are things like the note duration, the type of instrument that's playing, the pitch of that, and all of those things together make up a representation of the music. You can think of that like sheet music. And what comes next is the reasoning that we can apply so that we can make Bach-like music following the same patterns that we identified in the features. Or let's say you want to create an application to help you find the perfect Girl Scout troop for you. We can identify features that would make that possible such as what grade level the girl is going to be, the location of the troop meetings, the times that work for your family. And then we can actually say things like whether or not this troop officer does STEM activities or if they like outdoor adventures or service projects. And then we can put weights to those so that we can say, you know, I want to wait outdoor adventures higher than I want to rate service projects and I can find a troop that's just right for me. You can try out representation and reasoning using Google's Deep Dream Generator. You can apply an artistic style to an image that you upload and see how the representation takes the features of that art and applies it to your image. Try it today. It's fun. It's practical.