Comment Lessons from the physical world - 1831 bridge fail (Score 4, Informative) 63
Lessons weren't learned 180 years later either, for the Milllennium Suspension Bridge, which I happened to work next to at the time and watched the construction and failure unfold. People tend to walk in sync. When things happen in sync, a resonant pattern emerges. It's true for people crossing bridges. It's true for people synchronising machines to exact clocks and nice rounded-off times as well.