Uncontacted tribe - what is this all about?

Uncontacted means just that. They have been so self contained that they have no experience with the "modern" world. And all these questions you have about them can't be answered, because no one knows anything about them. There have been no cultural studies and no research done on them because we either didn't know they were there or we left them alone. Most likely they do not speak a modern language, but their own language. The might kill you on sight because you are something they have never seen before, just like they were trying to attack that stupid helicopter. People still do use bow and arrows, and lot of tribes do actually. And of course there are kids there. We don't have unknown tribes in America, but in South America and places like it, they don't enforce the law on tribes like this. They are uncontacted, so they don't have any sense of the world or government or school or even their geography. They have their own system, and hopefully wont be ruined by modern society.