A friend of mine, also Minnesotan by birth and primary education, posted something profound about the cause:
...on the cause of the bridge collapse, I think they'll determine it was a cascading failure and not a singular reason...this is a so-called black swan, an event no one would have expected.I believe he's been reading "The Black Swan" by Nassim Nicholas Taleb. Excellent work, both of you. I highly recommend the read. In fact here you go: to buy it; to wiki it; to drink it.