42 MPH… and an Entire Bridge Was Gone 😳

A gentle 42 mph breeze shouldn't destroy one of the world's longest suspension bridges… but in 1940, that's exactly what happened.

The Tacoma Narrows Bridge, nicknamed "Galloping Gertie," became one of the most famous engineering disasters in history. Drivers paid tolls just to experience the terrifying waves beneath their cars. Engineers tried to stop the motion with shock absorbers and cables—but nothing worked.

Then, on November 7, 1940, a 42 mph wind triggered a deadly aerodynamic phenomenon called aeroelastic flutter. Within hours, 600 feet of bridge collapsed into Puget Sound.

This disaster changed engineering forever and led to the wind-tunnel testing used on every major bridge today.

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