CNN's Allison Morrow tells "Nightcap's" Jon Sarlin that Elon Musk's Twitter antics are damaging Tesla's brand. Plus, high school teacher Cherie Shields argues that ChatGPT is an excellent teaching tool and schools are making a mistake if they ban the AI technology. To get the day's business headlines sent directly to your inbox, sign up for the Nightcap newsletter. (CNN US) More