When my wife saw me playing with my new encrypted radio, she asked what it was for. “Imagine,” I said, “if I could type a message on my phone and send it to you, and the message would appear on your phone. Instantly!” She wasn’t impressed. “It also works if phone lines are down due to a power outage… or societal collapse.” Still nothing. “If we’re not within radio range of each other, we can route our messages through a mesh network of our neighbors’ radios. But don’t worry! The radios encrypt our messages end-to-end, so nobody else can read what we’re saying.” By this point, she’d left the room.