Want to learn how to build a body? Can your design survive battles with infectious pathogens and disease? How does your design protect against parasites like worms? How does your design make sure it does not attack its own body? Will your design be able to receive body parts from other people’s designs? Do you choose to provide a home for bacteria? How do you tell which bacteria are beneficial or are enemies? Will your design heal upon injury? If so, how will your design prevent cancer? Should your design undergo depression? We will discover together how your body organizes immune cells, neurons, bacteria, and other building blocks to fight disease, but also inadvertently causes a lot of modern diseases.