The other thing that Plato is famous for is the notion of an academy, the place where he taught his students was a little field outside the walls of Athens named for the Athenian hero Akademos. And so that area became known as Plato's Academy. And ever since then, places of learning have often been referred to as academies, just like Khan Academy. But Plato was also concerned, like his teacher Socrates, with the nature of how we should be ruled. There will be no end to the troubles of states or indeed of humanity itself till philosophers become rulers in this world or till those we now call kings and rulers really and truly become philosophers and political power and philosophy thus come into the same hands. So like Socrates, he's wary of how they have been governed. And remember, we're now after the period of the Peloponnesian War.