Remember watching the “clap on! clap off!” commercials back in the day? I always thought that the idea that you could turn out the lights by clapping was pretty fantastic.  The idea seemed so fantastic, it would cause me to clap my hands in excitement and plunge myself into darkness.  No, I’m kidding – I’ve actually never been in a situation where “clap on! clap off!” was installed, but I bet it made a lot of people’s lives better. When it’s tough to get up, it’s nice to be able to alter your environment without walking over …