In this brilliant synthesis of scientific discovery throughout the ages, Isaac Asimov answers these vital questions. He begins with Genesis and its intuitive description of creation and proceeds through the trial-and-error experimental findings concerning regeneration, evolution, and inherit- ance. The structure of the cell itself is examined, and the biochemistry of its food and fuel processes. Here is a lucid picture of life on this planet as far as the light of science has been able to penetrate -a provocative study written to be understood and enjoyed by anyone who has asked in his child- hood "Where did I come from?"