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.

4th International AIDS Conference in Stockholm in 1988. Australian Judge Michael Kirby estimates the prevalence of HIV/AIDS and talks about the scientific discoveries so far. He reflects on the moral issues connected with AIDS and talks about stigma and civil rights.