Galileo's pioneering use of the telescope showed that the earth is not at the center of the universe and led to his trial and conviction by the Inquisition. This first clash between science and religion still bedevils us today in many ways. Galileo, however, made an even greater contribution to history when, in destroying medieval science and discovering the laws of motion, he established the procedure of modern science. As a direct result of his work, Revelation and Scripture as sources of truth were replaced by Experimentation and Measurement, while Tradition and Authority as interpreters of truth were replaced by Individualism and Egalitarianism. This tremendous alteration in the scientific process eventually swept through all non-scientific disciplines and created the modern world. A good case can therefore be made that Galileo is the most influential person in history. Even if one does not agree with the conclusion, tracing this dramatic change is one of the most exciting of intellectual adventures.