As part of the Science at Work series, Towers and Bridges: Making Ends Meet, sets out the principles of structural engineering. With a brief history of building bridges and towers, it then explains the basic forces which affect design principles. Illustrated with dozens of photographs and diagrams, the book provides an excellent overview of a growing industry as well as leads for further research and practical classroom projects. Written by teachers with decades of experience, the Science at Work series from Lakeview Publishing brings sound knowledge and project starters to upper primary and early high school students. A set of display cards for the classroom and activities is also available from the publisher.