Robert Pearl, a professor at Stanford medical school, was previously CEO of Kaiser Permanente, a US medical group with more than 12 million patients. If he was still in charge, he'd insist that all of its 24,000 physicians start using ChatGPT in their practice now. "I think it will be more important to doctors than the stethoscope was in the past," Pearl says. "No physician who practices high-quality medicine will do so without accessing ChatGPT or other forms of generative AI." Pearl no longer practices medicine but says he knows physicians using ChatGPT to summarize patient care, write letters, and even--when stumped--ask for ideas on how to diagnose patients. He suspects doctors will discover hundreds of thousands of useful applications of the bot for the betterment of human health.