For ages human beings have aspired to be more than what they were created. Improvement, if not perfection, of physical and mental strength has long been considered a desirable goal, and each of us employs different methods to achieve it. Diet and vitamins, exercise and transcendental meditation are among the formulas, each of which offers a do-it-yourself way to fulfill author George Eliot's message, 'It is never too late to be what you might have been."
This book, however, is not about any yoga or yogurt path to enlightenment, nor will it tell you where to find the best guru in town. It is, rather, about science's attempts to alter, control, and prolong -- indeed, even create -- life. It is about changing the very essence of nature, including human nature, through techniques once written about only in science fiction. Among these are all the methods lumped under the phrase "genetic engineering" -- transplanting genetic material from one living cell to