No more telling Mom you can't talk because your cell phone is "about to die"--it soon could be charging itself as you speak.
The Nokia Research Centre in Cambridge, England, is working on a prototype system that would eliminate the traditional cell phone charger.
The system collects energy from ambient radio waves emitted by antennas, TV masts, Wi-Fi transmitters, and the like. This might all sound uber-scientific, but we've been using this technology for years. Have you ever exited a store, only to hear the beep, beep, beep of an accusing alarm system? Many retailers … Read more