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<P>Have you ever wondered how bridges don’t fall down? Or how really old buildings stay standing up? In the How Do series, readers are welcome to guess and then explore the science behind the right answers. Basic principles of architecture and engineering, including an introduction to bridges, locks, arches, columns, and skyscrapers are explored through diagrams, photos, and informative and engaging text.</P>

How Do Bridges Not Fall Down?.css-1p8rvzy{position:absolute;padding-left:8px;}

How Do Bridges Not Fall Down?