Sci-fi movies often present us with omniscient villains who are able to track the most minute actions of their underlings and foes. Rarely do we get a glimpse into their surveillance systems, but you have to imagine that some of the more rudimentary "employee evaluation" hardware will not be too far off from KDDI's latest. The Japanese cellphone giant has unveiled a new system, built around accelerometers, that can detect the difference between a cleaner scrubbing or sweeping a floor and merely walking along it. Based on new analytical software, stored remotely, this should provide not only accurate positional information abo
