What do raising flags and moving heavy loads have in common? Both of them are made possible because of pulleys! In this volume, readers discover how pulleys play a crucial role in the world around them. The science behind pulleys is made understandable and exciting with the help of full-color photographs and illustrations, clear diagrams, and accessible text that highlights fun facts. This volume introduces key STEM concepts, fostering critical thinking and problem-solving skills. A concluding glossary helps build a strong STEM vocabulary, engaging curious minds eager to explore the science of simple machines.