https://en.wikipedia.org/wiki/North_Sentinel_Island
..which led to reading about other "uncontacted peoples", a fascinating and sad story.
https://en.wikipedia.org/wiki/Uncontacted_peoples
edit: Oh, it was 8 days ago. I submitted this[1] ripping yarn about an American with an anthropologist father and Yanomami mother returning to South America to find his mother after 20 years. I'd read his father's book about his life, work and marriage years ago.
Bob Connolly & Robin Anderson's amazing Highlands Trilogy[2] is about a mixed-race man trying to run a coffee plantation while living between western society and his New Guinea tribe. His father was the first white man to contact the tribe.
Jared Diamond's The World Until Yesterday[3] brought home for me what human life was like until very recently. You couldn't travel far in any direction without the tribe next door trying to kill you.
[1] https://news.ycombinator.com/item?id=18438586
[2] https://en.wikipedia.org/wiki/First_Contact_(1983_film)#The_...