gladwell dot com / The Pima Paradox: "All told, the collaboration between the N.I.H. and the Pima is one of the most fruitful relationships in modern medical science--with one fateful exception. After thirty-five years, no one has had any success helping the Pima lose weight. For all the prodding and poking, the hundreds of research papers describing their bodily processes, and the determined efforts of health workers, year after year the tribe grows fatter."