Chapter 11 has a strange addition to the vocabulary list: caduceus. Okay, that's the staff of Hermes, also a symbol of the medical profession. It's not the worst word in the world except that the students have not been taught who Hermes is. Okay, I know that he's mentioned in The Lightning Thief, but there should be a lot more. There are some great myths about Hermes, like his one, when he was born.
I keep hoping that there will be some deep content here, and this unit never ceases to disappoint me.