On a lush, remote island, modern civilization has recently made contact with what may be the last group of Stone Age people. The Sentinelese wear no clothes, do not know how to start a fire, and have fervently rejected the intrusion of outsiders. But all that is changing, writes Madhusree Mukerjee, who has had exceptional access to that island and the others that make up the Andaman chain in the Bay of Bengal. Over seven years Mukerjee found that the aboriginals ...