And in fact, the life of Socrates, we learn from the writings of Plato and Xenophon. Xenophon was also a historian who gave us some accounts of the later Peloponnesian War. You have the famous cynics, Antisthenes, and his student, Diogenes. Diogenes, famous for living in a barrel in Athens, and somewhat insulting Alexander the Great. But these cynics, which the word is derived from being dog-like, these are people who were philosophers who gave up the trappings of materialism and caring, frankly, what other people thought. As we go a little bit out of our timeline right over here, you have Archimedes, one of the greatest mathematicians and scientists of all time. But you also have contributions in the arts.