Book excerpt: It's hard to believe that common cold and flu symptoms, which are so disgusting, can actually be so useful! The science of why we sneeze, cough, or throw up is enthralling and necessary to understanding why our bodies react the way they do when we're not feeling well. This informative book details why and how the body performs such a gross reflex, and whether it means a person is sick or not. Filled with resources and self-care tips, this is a great guide for young readers to understand the mechanics of the respiratory and digestive systems.