Was THIS book a relief to parents when it came out! One of the few real "How to" learning books about bridges. It explains how & why different types of bridges don't fall down (which is why kids learn about em in the first place) & offers fun instructions on each major kind: arches, beams, trusses, cantilevers, and suspension bridges, you know the deal. Of course, "Bridges: Amazing Structure..."also shows why some bridges fail, like the Tacoma Narrows Bridge (you've seen this one go on disaster TV shows). Don't wait until your kid says, "Mom, I have to build a bridge by tomorrow." Do it now & put it into storage if necessary.