As scientists learn more about the gut microbiome, what role could personalised nutrition play in the future of health care? We imagine a scenario where biohackers injected themselves with mRNA, the technology used in some coronavirus vaccines. And, could an artificial intelligence ever win the Nobel prize for medicine? Tom Standage hosts.   Subscribe to The Economist for full access to print, digital and audio editions: www.economist.com/podcastoffer      See acast.com/privacy for privacy and opt-out information.