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The Tacoma Narrows Bridge was built in 1940 in Tacoma, United States and it was demolished 4 months after its opening due to resonance. Many engineering mistakes were made in the design of the bridge. It collapsed because the wind created a standing wave that got higher and higher on the bridge. The key ingredient to a standing wave is resonance, when the driving frequency (of the wind) matches the natural frequency (of the bridge).

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