by Dan Zettwoch

In this volume, meet Bea, Archie, Trudy, and Spence, otherwise known as the BATS!  They crisscross the globe using every type of bridge: beam, arch, truss, and suspension.  From ancient low-slung rope bridges to modern high-tech towers of steel, they’ll traverse ’em all.  along the way they’ll identify the dangerous forces trying to bring bridges crashing down, and how to defeat them…through engineering!