I found the novel still extremely entertaining; I find myself reading it whenever possible. I think that the book becomes so much more interesting when you actually have an idea about what Shubin is talking about, so thank you embryology! I did previously know that teeth were the hardest structures in our bodies, but I did not know that there was actually crystal molecules (hydroxyapetite) that make up our teeth. I, personally, feel like I am worth so much more now. I was also a little surprised to hear that our first bones were made for eating and not for protection. Although it was not new news to me that human embryos have their own set of “gills,” it kept me wondering what would happen if the gill slits didn’t close at all?