In this episode, Ologies podcast host Alie Ward interviews genderqueer researcher Dr. Daniel Pfau. Dr. Pfau talks extensively about gender in biology, including queer behavior in animals, how hormones influence the brain, the variation of gender expression, how a strict gender binary is harmful to entire populations, hormone replacement therapy, and hormones in sports. The episode page includes streaming for Parts 1 and 2, as well as a transcript and show notes.