The Sunday Times’ tech correspondent Danny Fortson brings on Walter Isaacson, the biographer of Elon Musk, to talk about his new book (3:10), Musks’ “heartlessness” (6:15), his maniacal sense of mission (10:50), his approach to pro-creation and children (18:00), his fear of loneliness (21:55), and why he can’t smell the flowers (25:00), the reaction to the book (28:35), why Isaacson doesn’t make judgments (30:10), “demon mode’ (34:30), the Twitter deal (38:45), and his political tack right (40:00).