getting ahead

Every chapter chooses an interesting aspect of the human body to discuss. In this particular one, Shubin explains the "wiring" inside our heads. I have always been fascinated by how humans are able to control every single muscle starting with a thought of wanting to do so. I cannot imagine how complicated the inside of our heads actually are. As Shubin explains it in a way to compare to the head or the formation of a shark, he started to lose me. I couldnt really get the grip of the arches and all. But the part about messing with the frogs' genetics caught my attention again. The human body as a whole is so complicated and skilled in many ways, and the way Shubin explains it, we all started out as simple as fish.