Marty Cooper, the inventor of the cellphone, was skiing in Vail, Colo., with a friend, Masami Yamamoto, and was at the bottom of a hill waiting on Yamamoto. After several minutes of waiting, Marty went to his home and called his friend's cellphone -- and learned that Yamamoto had skied off a cliff above a drop of several hundred feet and was stuck. Over the next several hours, Cooper coordinated with Yamamoto and the Vail Dispatch Center to determine his friend's exact location, which led to his rescue. It was a life-saving use of the cellphone by a man who is credited with inventing the fantastic device. Watch the video.