The hardest of all is learning to be a well of affection, and not a fountain; to show them we love them not when we feel like it, but when they do.
I will try to cram these paragraphs full of facts and give them a weight and shape no greater than that of a cloud of blue butterflies.
If we take as given that critical infrastructures are vulnerable to a cyber terrorist attack, then the question becomes whether there are actors with the capability and motivation to carry out such an operation.

