It seems fairly elementary when you think about it. Engineers (or somebody) tried to lift parts of Juliana Bridge in Alphen aan den Rijn in the Netherlands with the crane sitting on a barge in the canal. But wait, as the load moves it has the capacity to tip the barge. That would make the cranes slide. And so this spectacular accident played out Monday with two cranes falling across row houses in the town. As many as 20 were injured but it appears not too seriously. And the Dutch are supposed to be so smart.