In today's environment, critical infrastructure (power substations, railroad controls, etc) needs to be completely separated from the internet. I know a lot of convenience and efficiency can be gained through all this connectivity, but the risk from hacking or error is too great.

Similarly, I keep getting offers related to moving toward the "smart house" concept, where everything including the appliances is interconnected. I guess I'm just an old fuddy-duddy, but even for an old sci-fi fan like me, I can't think of a less appealing concept for a house. The last thing I want is to switch my heat pump off, and have it tell me; "I'm sorry Dave, I'm afraid I can't do that".