That clunky old Android phone sitting in a drawer may be more useful than you think. A team from Carnegie Mellon University has created a program called Zensors that uses connected smartphone or surveillance cameras to track your environment, figure out what's going on and give you valuable alerts and statistics. The team showed how a user can point a smartphone outside a window, circle an area of interest, and pose a natural-language question like "how many cars are in the parking lot?" Zensor then proceeds to track cars as they enter and leave, giving a business data about its customers.