Tonight Rachel explained that the reason the I-5 bridge over the Skagit River collapsed was because its design consists of "fracture critical" members that share the burden of the bridge's load such that if one piece fails, the whole structure falls apart. As strong as all those beams and girders look, ultimately

Need help? Need to shout out the answer without spoiling anyone else's game?
*Remember to mention the number of the puzzle you're talking about.
