At the McCormick School of Engineering and Applied Science at Northwestern University, a research group has developed a unique new way for your computer to detect whether or not a user is present, and are presently looking for test subjects willing to try it out and see just how much power it can save. Using your computer’s existing hardware, the microphone and speakers more precisely, echolocation software will determine whether you’re watching a movie (present) or getting a snack (away). Discussions among the group led to the idea of using sonar, as well. Developing software that, when the user is not using the mouse or keyboard, plays a tone at a high frequency and records the tone’s echo, the computer then has the ability to process the tone and filter out everything except that frequency and detects any variance. The software can... --..