Kevin Cirilli hops on the Magic School Bus of the future with Terry Poon to explore one of the coolest ideas in medicine: a digital twin — a tiny computer version of you that lives in your phone and learns everything about your body. This AI twin watches your steps, your sleep, your snacks, your stress, and even how your body reacts to certain foods. Then it talks to you like a super-smart helper that says, “Hey, if you eat this, your blood sugar will be happy,” or “Time to move a little!” Kevin and Terry break down how this mini-you can predict what meals are good for you, help you make choices that keep you strong, and even talk to your doctor so you don’t have to. It’s science fiction that’s already real — an AI friend made just for your body.