National Geographic un-contacted tribe

Saw this today and it kind of blew my mind. It's amazing to me that their are still humans in the world who have know idea what the world has become... contacted or un-contacted. Very Cool.

http://news.nationalgeographic.com/news/2011/02/pictures/110202-uncontacted-tribe-pictures-photos-amazon-science-indians-brazil-arrows/?source=fohomesc1#/uncontacted-tribes-new-pictures-huts_31965_600x450.jpg