XVII International AIDS Conference in Mexico City. Interview with three pioneers in the HIV/AIDS response - Dr Mervyn Silverman, Dr Paul Volberding, and Dr Lars Olof Kallings. They talk about the history of the AIDS movement.

Helene Gayle is an AIDS expert who has been working in many different initiatives in the US, among them the Centers for Disease Control (CDC). She also works in President Obama's advisory group on HIV/AIDS. Here she talks about understanding and changing behaviors.