Comments:Brazil spots unknown tribe of indigenous people in Amazon jungle

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"Most of Brazil's indigenous groups have not changed their languages or traditions"

This is highly unlikely. I lack a good reference, but I'm from Brazil and know personally anthropologist that study modern tribal changes, such as wearing industrialized clothes, playing football, etc. I'd be bold and say it's common sense here that tribes have been deeply affected by modern civilization.

Comments from feedback form - "It should be less wordy in ord..."

It should be less wordy in order to improve readability. For example, "...tribe is likely to belong to the pano language group," could instead say, "...tribe likely belongs to the pano language group."