Today marks the 67th anniversary of one of the most famous engineering disasters of the 20th Century: the failure of the Tacoma-Narrows bridge. "Galloping Gertie", as the bridge was referred to because of its propensity to move, was subjected to 35-40 mile per hour winds this day in 1940, causing the center span to begin a harmonic oscillation that eventually led to structural failure. It was a unique event for the time in that the collapse was filmed, allowing engineers a spectacular view of the bridge's failure.
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