It's said that he was the best of Plato's students and he stays there till he's 37 when Plato passes away in 343 BCE. At that time, Aristotle goes to become a tutor, probably the highest paid tutor in all of the universe, tutoring Alexander the Great. How great is it to tutor Alexander the Great? And he must have done a really great job because Alexander the Great goes on to conquer the Western world. Alexander the Great is said to reward Aristotle with all of these awesome resources where Aristotle is then going to go back to Athens and start what's called Lycaeum, a new school with a great library that's borrowed in much from Alexander the Great. Now, Aristotle is going to be a little bit different than his teacher, Plato. Plato was focusing much on the ideas of idealism, of truth, of form, and Aristotle is a little bit more scientific based.