I think cyber security, cyber warfare will be one of the biggest challenges facing the next president, because clearly we're facing at this point two different kinds of adversaries. There are the independent hacking groups that do it mostly for commercial reasons to try to steal information that they can use to make money.
When you drop a glass or a plate to the ground, it makes a crashing sound. When a window shatters, a table breaks, or a picture fall of the wall, it makes noise. But as for your heart, when that breaks, it's completely silent. . . and you almost wish there was a noise to distract you from the pain.