Reading the news, it’s easy to get the sense that we’re all about to walk into a 1980s science fiction movie. Your phone tells your thermostat that you’re on the way home, so that it can adjust the temperature accordingly. Your car tells your home stereo where you were in the playlist, so that the stereo can turn on and take over. Your door recognizes you when you grab the knob and automatically unlocks. Lights come on as you walk into each room, etc., etc.