Readers discover how these extraordinary feats of engineering are created, and apply what they have learned to hands-on, critical-thinking activities that include building different types of bridges, such as truss, cantilever, and suspension bridges, out of different materials and modeling different types of supports. They examine the natural forces that affect structure selection and appearance, and also learn about the types of support required for each. Includes trivia, cartoon illustrations, links to online videos and other sources, and clear diagrams.