"In 1984, Swiss traveler Bruno Manser joined an expedition to the Mulu caves on Borneo, the planet's third largest island. There he slipped into the forest interior to make contact with the Penan, an indigenous tribe of peace-loving nomads living among the Dayak people, the fabled 'Headhunters of Borneo.' Bruno lived for years with the Penan, gaining acceptance as a member of the tribe. However, when commercial logging began devouring the Penan's...