Smart skin patch listens to your body sounds, from heart to gut

Let me hear your body talk. A new electronic tattoo picks up on subtle noises inside the human body, including the sound of your heart, muscles and gastrointestinal tract. The skin patch could be used in medical monitoring, to detect irregular heartbeats, for example. It could also act as a human-machine interface to use your voice to control a video games. "Our body generates a lot of different sounds," says Howard Liu at the University of Illinois at Urbana-Champaign.