good morning. we begin this hour with a look at one of the most influential and controversial figures in the world today, elon musk. it was just over a year ago the spacex and tesla ceo completed his acquisition of twitter. since then, he s had no shortage of battles, we spoke about it with walter isaacson, his biographer. talk about writing at elon musk during a volatile time of his life publicly. talk about the challenges and awards as an author you got out of that. first of all, he has been volatile his whole life. as a kid, 2018, he s going just as crazy at times as you see him in the past couple of years. when i started this book, when we first started talking about it, he was the guy bringing us into electric vehicles and the only person who could send people into orbit in the u.s. i thought, good technology story. then a year into my reporting, he is secretly buying up twitter, going to hawaii in a two- to three-night binge and deciding to take it over. it became a