There are more than 100 un-contacted tribes known worldwide, with more than half living in either Brazil or Peru. These tribes simply, and intelligently, reject contact with the outside world. The recently photographed tribe above certainly knows about the outside world but rather chooses to live a very isolated way in the Amazon.
The Brazilian Government has known about these tribes since 1910, and actually has had a policy of no contact with the tribes since 1988, in an effort to protect them from illnesses and preserve their chosen way of life.
I must say it is very refreshing to be able to see people living a more simple, centered, genuine way of life. It gives me hope that I too should not fight my desire to live in a similar fashion, far from the chaos that is North American Society.

