Wow, thanks a lot for posting this SC.
To expand upon the explanation of The Happy One:
In a race to develop the replacement for Jonas Salk's polio vaccine (which is derived from monkey cells), one doctor went to the Congo and used chimpanzees vs the types of monkeys that had been used to that point. The advantage to using chimp cells is that they are easier to work with since the multiply quickly (I believe that was it) but the problem is that some chimps carry a virus (SIV) that is the equivalent to HIV in humans. Since the vaccines are known to harbor more than just the virus needed for the polio cure, it was possible for SIV to be transmitted in the polio vaccinations......and there you have it.
A good portion of the video is interviews with the doctors involved in the Congo based vaccine denying that they ever used chimps.....the other portion is evidence supporting the fact that they did use chimps.
Something I thought was pretty wild: Chimps injected with HIV do not develop AIDS, they develop antibodies and the HIV disappears. Too bad it didn't work the other way around.
I learned a lot about AIDS (or so I thought) in a class back in high school. The info mainly covered the transmission of AIDS from Africa to America...blaming a gay Flight Attendant named Gaetan Dugas (sp?), also known as Patient Zero.
As explained in the video, a lot of the backlash against this hypothesis is that it would mean that the Westerners are responsible for infecting the world with AIDS, not those dirty Africans.
If you have 90 minutes, I urge you to watch this.