In this engaging discussion, biologist Katsuhiko Hayashi, renowned for his groundbreaking research on in vitro gametogenesis, unveils the fascinating possibilities of creating sperm and eggs from ordinary cells. He shares insights on how this technology could enable same-sex couples to conceive using their own DNA. Hayashi also explores the potential impact on endangered species, such as generating eggs from northern white rhinoceros skin cells. The conversation touches on ethical considerations and the future of reproduction, setting the stage for a new frontier in biological science.