In this video segment adapted from NOVA scienceNOW, learn about engineering innovations that could help detect a bridge's structural weaknesses before they become dangerous. [5:21]

Middle schoolers are presented with a brief history of bridges as they learn about the three main bridge types: beam, arch and suspension. They are introduced to two natural forces - tension and compression - common to all bridges and...

Here's an ebook with descriptions, locations, and pictures of bridges all over the Cuyahoga Valley.