Bridges vs. Tunnels
Bridges vs. Tunnels  
Podcast: Brains On! Science podcast for kids
Published On: Wed Aug 26 2015
Description: We’ve gotten a lot of questions about bridges and tunnels: How do bridges stay up? How are tunnels built? How do they build bridges over water? How do they put tunnels underwater? To answer these questions we’re staging a little friendly competition: bridges vs. tunnels!