Miranda Lowe, a Principal Curator at the Natural History Museum, and Alex Cagan, a genetics expert from Cambridge, explore the astonishing abilities of the 'immortal jellyfish.' This jellyfish can reverse its aging process under stress, raising intriguing questions about human longevity. They discuss the challenges of studying this delicate creature and compare it to other regenerative animals like axolotls. Alex also reveals insights into the genetics of long-lived species, including the remarkable adaptations of the naked mole-rat, suggesting potential pathways for human health.