basic element in nature, Pythagoras of Samos reached the conclusion that the earth is round. Pythagoras concluded that the universe was constructed of numbers and their relationships. He was a pioneer mathematician. And Hippocrates, "Father of Modern Medicine", taught that diseases are the result of natural causes, rather than of "demons".
             The Greek philosophers searched for the truth and for guidance to a good life. During the last half of the fifth century BC professional teachers, called Sophists (intellectuals) taught a variety of subjects. The Sophists submitted all beliefs to the test of rational criticism. They emphasized careful analysis of ideas and of problems of everyday life. Socrates, Plato, and Aristotle are considered to be among the greatest Sophists of all time. They believed that truth could be recognized through rational thought and deliberate and careful observation and that virtue and quest for goodness would lead to peace and happiness.
             Socrates-made his students question all things as a way of arriving at the truth. His method of questioning is call the:
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