This Sunday is a big anniversary in the fight against HIV/AIDS. It'll be 30 years since the virus was first reported. Of course, back then, doctors didn't know what caused it, how it was transmitted, how to prevent it or how treat it.
But over the past 30 years, we've seen some crucial moments in the fight against HIV/AIDS - from the death of Rock Hudson to Elizabeth Taylor's amfAR; from Tom Hanks in the film 'Philadelphia,' to the development of anti-retroviral drugs.
This amazing interactive time line from CNN picks one moment for each year that we've known about HIV/AIDS, and explains what it meant and why it mattered.
Keep your eye on the bottom of the graphic while you scroll through the years. There's a running tally of cumulative deaths and diagnoses since 1981.