In the sixth episode of this series, Lance is joined by Carole Hooven, PhD, lecturer and co-director of Undergraduate Studies in Human Evolutionary Biology at Harvard University. She also wrote the book, T: The Story of Testosterone, the Hormone that Dominates and Divides Us, which focuses on testosterone and sex differences. Together, they discuss the science around testosterone in relation to this transgender athletes, the idea of biology vs. ideology, and why the focus should be on policies, as opposed to individual athletes.