Ken Hayworth, a postdoctoral fellow at Harvard, has come up with an unusual potential form of immortality by preserving the human brain in a computer. Most theories of extending life, such as using experimental supplements or super-sensitive health monitoring, work with a person’s existing body. Hayworth suggests that it might be possible to copy your brain, complete with all its thoughts, memories and learned abilities, for use in a form other than the body you have used all your life.