What something is made of is integral to it functioning properly. From plastic to wood, materials matter, as readers discover alongside a cute blue monster named Mo. Waterproof materials, elasticity, heat conservation, and more are all discussed in the colorful pages of this book. Readers consider what to wear when sailing, how a bell works, and why ice cream melted as they discover the exciting world of materials! Questions throughout the text keep readers engaged with what they are reading.