Musk’s biography: “Sad & smart son slowly morphs into mentally abusive father he abhors except with rockets, cars & more money.”

How much have we learned from Elon Musk’s latest biography, written by star biographer Walter Isaacson? The Guardian says eight, Barron’s says three – while just as many headlines seem to focus on how many kids he has (I think it’s 11.) The best – and shortest – book...