Todd Spangler NY Digital Editor In case you didn’t get enough of Elon Musk in “Elon Musk,” the 688-page authorized biography of the tech mogul penned by Walter Isaacson, here comes a new podcast from Isaacson talking about his experience spending two years shadowing the world’s richest person to research the book. The “On Musk” podcast, produced by iHeartPodcasts and Kaleidoscope, premieres Dec. 12 on the iHeartPodcast Network (at this link) and all major podcast platforms, with all four episodes available at launch.