How Firm Is Your Foundation?

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T: Soldiers break step when marching over bridges (trivially observed).

U: Bridge falls down if soldiers don't break step when marching over.

Fb: Bridge falls down due to resonance if soldiers don't break step marching over. Broughton suspension bridge, England, 14 April 1831, fell under soldiers march, but prob just overloaded, not resonating. Mark Brader posted Times story!

F: Otherwise sound bridge falls down if soldiers don't break step marching over. (There have been no documented instances of this)