Chapter 2 mentioned work done by Bacon and Descartes in the field of facial expressions signaling emotion. I found this to be interesting because I often fail to realize that my facial expressions give away exactly what I am feeling, whether good or bad. I find that it can be difficult to hide emotions because facial expressions may give away one's internal feelings. This reminds me of "Poker Face," when a card player has to keep his facial expressions at bay to not reveal any gains or losses in his hand of cards. On the other hand is the saying about "wearing your heart on your sleeve" when surrounding people can easily tell how one is feeling due to their facial expressions. In this video, the woman is talking about the many types of facial expressions a human can show.