The future that we see in science fiction promises that we will soon be able to trash our Clappers and start activating our favorite household electronics with our voice. But there are limits today. Blame Earth.
Microsoft's new Kinect audio and visual sensor, when plugged into an Xbox — which is plugged into your TV — will let you play and pause movies with your voice (or with waves of your hands). But it won't let you turn the whole set-up on and off.