We're focused this week on the past 30 years of HIV/AIDS and how the disease - and with it, the world - has changed in those three decades.
But what does 30 years really mean?
To me, it's nearly a lifetime. To early patients who have survived and are with us today, it may feel like a miracle.
To help put it into context, some of my colleagues made an incredibly moving brief video about the timeline of AIDS research and advances.