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What tragedy occurred today in 1903 that led to the type of door found in virtually every place of business today?

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Answer:

The Iroquois Theatre Fire in Chicago. More than 600 people died when the proclaimed "absolutely fireproof" building caught fire during a matinee show. A host of design flaws, including substandard exits, led to the massive number of casualties. Following the fire, the crash or panic bar-style of door (above) became commonplace on all emergency exits.