Spit and Phlegm!

The human body is pretty gross when it gets sick. The nose gets stuffed up, and some people go through boxes of tissues trying to get it clear. But what is all that stuff in the ears, nose, and throat anyway? It's phlegm! This sometimes gross and always fascinating book explores why our bodies make spit and phlegm through colorful photographs and insightful explanations of bodily functions. Readers will discover the science behind this gross stuff, studying why we need saliva to eat and phlegm to protect ourselves from bacteria and illness.