Telegraph: Send Tashka Yawanawa an email, he tells you, and he will reply "to the singing of a thousand frogs'. He'll be online at home in a traditional Indian village in the headwaters of the Amazon, reachable only by canoe.
Remote though he may be, he remains connected -- his computer powered by solar energy. For besides being the leader of his people, who occupy some 675 square miles of rainforest on the upper Gregorio river in far western Brazil, he is both a computer scientist and a pioneer of a new...