From Pulitzer Prize-winning author Edmund Morris comes a revelatory new biography of Thomas Alva Edison, the most prolific genius in American history. Although Thomas Alva Edison (1847-1931) was the most famous American of his time, and remains an international name today, he is mostly remembered only for the gift of universal electric light. His invention of the first practical incandescent lamp 140 years ago so dazzled the world—already reeling from his invention of the phonograph and dozens of other revolutionary devices—that it cast a shadow over his later achievements. In all, this near-deaf genius ("I haven't heard a bird sing since I was twelve years old") patented 1,093 inventions, not including others, such as the X-ray fluoroscope, that he left unlicensed for the benefit of medicine. One of the achievements of this staggering new biography, the first major life of Edison in more than twenty years, is that it portrays the unknown...