Alex Thompson, 31, is a pioneer in interactive television. Her company, Mixed Signals Technology, places data in-between the broadcast video frames on shows such as Wheel of Fortune and Jeopardy so that viewers at home can play along with the on-air contestants. And advertisers can collect information about just exactly who out there is watching...and playing. Thompson was selected to Technology Review's list of 100 Top Young Innovators. At the daylong conference announcing those chosen, Audible's John Barth sat down with this under 35, cutting-edge thinker to discuss her work. Technology Review is MIT's magazine of innovation.