With its splendid modern architecture, the Hyatt Regency was the place to be seen in Kansas City in 1981. Beneath space-age walkways, guests drank, laughed and danced... not realizing that the 60 tons of of glass, concrete and steel hanging above their heads was about to come crashing down.

One hundred and fourteen people died. But why? Was it cheap materials? Shoddy construction? Or a tiny error that seemed so insignificant that no one paid it any attention?

For a full list of sources go to timharford.com

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