Sensor Reads Whole Room's Electrical Field to Detect Movement or Heart Attacks Within | Popular Science

Sensor Reads Whole Room's Electrical Field to Detect Movement or Heart Attacks Within | Popular Science: "It is based on electrocardiograms, the same technology used to monitor your heartbeat. An EKG uses a series of electrodes that record signals from the heart. PassivSystems, based in Newbury, England, is working on a sensor that uses ultra-sensitive electrodes to detect the body's influence on the ambient electric fields in a room."