Watch this video about AIDS on HowStuffWorks. According to the latest UNAIDS/WHO report, nearly 40 million worldwide are now living with HIV/AIDS. In 2006, 2.9 million people died and another 4.3 million were newly infected. While sub-Saharan Africa has just more than 10% of the world's population, it is home to more than 60% of all people infected. See how AIDS monitoring works in this video from Medialink.