Casey is taking his newsletter Platformer off Substack, as criticism over the company’s handling of pro-Nazi content grows. Then, The Wall Street Journal spoke with witnesses who said that Elon Musk had used LSD, cocaine, ecstasy and psychedelic mushrooms, worrying some directors and board members of his companies. And finally, how researchers found a new class of antibiotics with the help of an artificial intelligence algorithm used to win the board game Go.Today’s guests:Kirsten Grind, enterprise reporter for The Wall Street JournalFelix Wong, postdoctoral fellow at M.I.T. and co-founder of Integrated BiosciencesAdditional Reading: Why Platformer is leaving Substack.Elon Musk has used illegal drugs, worrying leaders at Tesla and SpaceX.Researchers have discovered a new class of antibiotics using A.I.We want to hear from you. Email us at hardfork@nytimes.com. Find “Hard Fork” on YouTube and TikTok. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app.