Publisher's Synopsis
From award-winning science writer Jim Carrier comes the remarkable story of GPS - an invention so woven into the fabric of modern life that we take it for granted. A troubled child of the Cold War, satellite navigation was created to aim nuclear missiles. Today, it is also used to find grandma's house, guide drones, track packages, plant crops, spy on each other, and keep time. it is difficult to imagine civilization without it. This easy-to-understand primer, with 25 photos and illustrations, provides a basic understanding of the history, science, wizardry, and potential of knowing precisely where we are.
