Around 1900, German nuns helped establish one of the rarest languages on Earth: Unserdeutsch, a fascinating mix of German, English and Tok Pisin. It's the only German-based Creole language in the world, and was spoken in a specific region of German-New Guinea. Today, the descendants of those pioneers still speak Unserdeutsch, and a German linguist from Augsburg visited them in Australia, where they came to after Papua New Guinea became independent and a sovereign nation in the second part of the 20th century.