Apple may be working on some advanced medical features for its wearable devices The San Francisco Chronicle has learned. According to the publication, Apple “is heavily exploring medical devices, specifically sensor technology that can help predict heart attacks.” Apparently Tomlinson Holman, who invented THX and 10.2 surround sound, is leading the project, researching ways to predict heart attacks by studying the sound blood makes when flowing through arteries. Holman, who developed THX movie sound technology that “consistently reproduces high-quality sound in movie theaters and homes that most closely matches the original audio mix of films,” joined Apple in 2011, to provide “audio direction” for the company, according to his LinkedIn profile. While his focus was believed to be on iPhones