This video segment adapted from NOVA scienceNOW features two engineering innovations designed to improve structural safety in bridges. The video shows how sound waves can be used to detect cracks in steel and other signs of bridge instability undetected by the human eye. A second approach involves painting onto the bridge a "sensing skin" made of microscopic carbon nanotubes that use electrical currents to reveal structural damage or weak spots. This resource is useful for introducing components of Engineering Design (ETS) from the Next Generation Science Standards (NGSS) to grades 6-12 students.
This video is available in both English and Spanish audio, along with corresponding closed captions.
Visit the program page here.
© 2014 PBS & WGBH Educational Foundation. All rights reserved.