There's a great Radiolab episode, Patient Zero (http://www.radiolab.org/2011/nov/14/ http://www.radiolab.org/2011/nov/14/), that covers the the spread of AIDS a

There's a great Radiolab episode, Patient Zero (http://www.radiolab.org/2011/nov/14/ http://www.radiolab.org/2011/nov/14/), that covers the the spread of AIDS and tracing the disease back to its origin.