A Waiapi man walks on the road in the Waiapi indigenous reserve in Amapa state in Brazil on October 15, 2017. Tribal chieftain Tzako Waiapi perfectly remembers the day almost half a century ago when his hunting party stumbled across a group of white adventurers in the Amazon rainforest. Within months, nearly everyone in his entire tribe had died from disease. / AFP PHOTO / Apu Gomes / TO GO WITH AFP STORY "When the Waipai tribe almost died out" by Sebastian SmithAPU GOMES/AFP/Getty Images