Aristotle's childhood was not very well documented, but we do know that he was born in Stagira, Macedonia. He was the son of a noble physician but did not share his father's calling. At the age of 17 Aristotle began studying at Plato's Academy. He stayed there for about 20 years but moved away when his mentor, Plato, died. After marrying, Aristotle moved to the Macedonian capital, where he tutored a young man named Alexander (the Great). When Alexander went about his conquests Aristotle decided to move to Athens where he would start a school called the Lyceum.

One of Aristotle's contributions was Physics. In astronomy he proposed a definite spherical

Aristotle also made an illustrious contribution in logic. He developed rules for chains of reasoning that would never lead from true to false conclusions. In reasoning, the basic links are syllogisms: propositions, when put together give a new conclusion. Science results from complex constructions of reasoning systems. In his logic, he proclaimed dialectic works test opinions for logical consistency, and analytic works deductively from experience and observation.

Yet another well-known advancement was that of Aristotle's Biological studies. In Zoology he explained a fixed set of natural species reproduces true to type. The exception is some worms and flies come from rotting fruit or manure by spontaneous generation. These typical life cycles are known as epicycles: the same pattern repeats through linear succession of species. These processes are intermediate between the heavens and terrestrial elements. These species form a scale, which ranges from

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