Hostile nations have breached U.S. infrastructure. But don’t panic

Don’t worry too much. But don’t be too happy either.
That seems to be the mixed message to Americans who rely on the nation’s critical infrastructure for just about everything that defines modern life: Lights, heat, air conditioning, clean water, transportation, appliances, TV, the expanding Internet of Things (IoT) and, of course, social media.
There has been ongoing, sometimes fierce, debate for more than a decade about the likelihood of a cyberattack taking down the gr