This document discusses memes and memetics. It defines memes as units of cultural inheritance that can spread from person to person through learning or imitation. Memes spread through communication in a process analogous to biological evolution and natural selection. Groups of memes that benefit each other form memeplexes. While some memes spread because they are useful, others spread due to features of human psychology like emotional appeal. The concept of memes itself has become a meme that infects people. The document concludes by announcing the topic of the next session.