What does it mean to be human? In what does our humanity consist? What must we have to be truly human, and what can we lack and still rightly be called human? How does being human relate to and compare with other things, material (stones, plants, other animals) and immaterial (angels, the gods/God)? Is there in fact one human nature, or are there many? Do we flourish most when we act in accord with our nature, or when we oppose it? This course examines the philosophical exploration of what it means to be human. During the first semester, we will consider classic responses to this question, all of which have had lasting and enduring cultural and philosophical impact. We will look at two figures from classical Greece (Plato and Aristotle), one from China during the Warring States period (Mencius [Mengzi]), and one from Medieval Latin Christendom (Thomas Aquinas).