Today, with scientific advances and the rise of new technologies, medicine can sometimes come to seem downright science-fictional. Some people dream of combining medical breakthroughs and high-tech innovations to transform human beings through science, improving our lot, and living for longer in better health. But not everything is all that simple. While transhumanists may believe they're working for the good of humanity, others question the legitimacy of their approach: should we tamper with human nature? Who really profits from this medical revolution? How far will it go?