The surge of innovation that has given the world everything from iPods to talking cars is now turning inward, to our own minds and bodies. In an adaptation from his new book, Washington Post staff writer Joel Garreau looks at the impact of the new technology. In the next couple of decades, Ray Kurzweil predicts, life expectancy will rise to at least 120 years. Most diseases will be prevented or reversed. Drugs will be individually tailored to a person's DNA. Robots smaller than blood cells -- nanobots, as they are called -- will be routinely injected by the millions into people's bloodstreams. | 
