FULL TITLE: Voice of Thomas Edison's talking doll is heard again after 123 years as scientists crack the code of mysterious metal ring For decades it lay in the bottom of a secretary's desk drawer, its purpose unknown. But now, 123 year after it was made, the secret of this bent metal ring, which was found in Thomas Edison's laboratory, has finally been uncovered. Scientists have found that the microscopic grooves on the ring make up the tune of 'Twinkle, Twinkle, Little Star' and mark the world's first attempt at a talking doll and the dawn of America's recording industry...