Embedded sensors are cheap and more importantly, they talk to each other and the grid. In an office building, for example, sensors can manage heat, air conditioning, office lights, building security, and video concierge service all from one location. The concept of "smart buildings" has been around for 10 years, but it has now arrived. It's real. With embedded sensors, software and a dashboard to control all connected elements, the building now becomes a "smart building." Did 25 per cent of employees forget to turn off their computers? No problem; Cisco systems can turn them all off remotely and save electricity.