Journal Sentinel: In one of the first studies of its kind, energy researchers in Madison have uncovered a simple way that most consumers can save on their electric bills: pull the plug. The researchers set up more than 700 in-home metering devices in about 50 homes to monitor the proliferation of electronic devices in our homes, and how they affect our energy use. Thirty years ago, federal data shows, a typical home had about three plugged-in devices. The new study shows our wall sockets are …