Here's a can of worms for you all, if anyone wants to discuss: Where the hell did HIV come from? Such a serious disease. No record of it prior to 1959, then, by the 1980's, it was epidemic. There are tons of conspiracy theories about the origins of the virus: some think it was created in a laboratory, others think it doesn't even really exist. I think that whatever the case, something crazy must have started it. Colonialism in Africa predates the spread of the disease by centuries.