Consider the salamander. If it loses a leg, it can grow a new one. What if a person who lost a hand or a kidney could grow a new one? This may sound like something from another sci-fi movie, but it could happen. Researchers are studying the genes that let salamanders grow new legs, and they hope to learn how human beings might do the same thing. Growing a new part of the body could be the best way to go. On the other hand, some people, if they had the choice, might prefer bionic devices. In sci-fi movies, you may have seen people become cyborgs half human being, half machine with bionic parts that give them special powers, such as super-human speed or strength. Think about it. If bionics could turn you into a superman. what would you do?