Paxton has a sore throat, so his mother takes him to the doctor. His older sister, Paige, tags along just to make trouble. During Paxton's exam, the siblings are horrified to learn that there are tiny creatures living in Paxton's mouth and in ours, too!

What begins as an ordinary doctor's visit soon turns into an amazing scientific expedition into the small world of microorganisms. As Paige and Paxton explore this fascinating microscopic world, they discover that the tiny creatures living there are a lot like everyone else: some are helpful and some are harmful.

Through the whimsical adventures of these lovable puzzle piece siblings, young readers are introduced to the exciting field of microbiology in a way that feels more like a story than a science lesson. With playful sibling banter, memorable characters, and easy-to-understand explanations of germs, microbes, and healthy habits, children naturally absorb key STEM concepts while following Paige and Paxton's latest adventure.

Part of the STEM Adventures with Paige & Paxton series, this engaging story helps children discover fundamental STEM principles through the childhood experiences of puzzle piece characters who live, work, and play in the puzzle-shaped island nation of Puzzleland.