From assembling furniture to building complex machines, screws are an essential tool for many mechanical endeavors. This volume explores how screws work and are used, providing a foundational knowledge of simple machines in an informative and practical way. Helpful photographs, engaging diagrams, and accessible text filled with interesting facts draw young readers in with fun and relatable examples. Essential STEM concepts are introduced, promoting critical thinking and an early understanding of engineering, while a concluding glossary helps expand readers' vocabularies. This informative reading experience enables curious minds to explore the science of simple machines.