 In the new NPR and CBC podcast series Tested, a surprising history of women's sports, host and science journalist Rose Eveleth traces the century-long history of sex testing in elite sports through the eyes of athletes, historians, scientists, and doctors. And in the lead-up to the Olympics, I sat down with Eveleth for a closer look at the issue and how Tested explores a question that goes far beyond sports. What's fair and who decides?