Hang From a Hot Air Balloon to Get the Shot, Walk From Russia to Australia, Learn the Chimps' Lingo, Get the Real Story Behind HIV, and Visit Morocco's Bazaars

This week, we see the world through the eyes of one of Nat Geo's top photographers and hang from a balloon to get the shot; learn that 3 mph is the perfect speed for humans and find the love of foot power; translate chimpanzee's language and learn what they're really talking about (it's food); and learn the real history of the HIV pandemic.