SkinTrack Turns Your Arm Into a Touchpad. Here’s How It Works by Liz Stinson from on 2016-05-13 11:00 (#1DM03) New research from Carnegie Mellon shows how you can use your skin as an extension of your smartwatch screen. The post SkinTrack Turns Your Arm Into a Touchpad. Here's How It Works appeared first on WIRED.