This was really cute, but I don't currently have the right demographic either in my house or in my classrooms for the content. I am all about vestigial everything (in bodies and in language) and yet I had no idea about the disappearing kidney: mind. Blown. I thought the insistence on providing pronunciation guides for the scientific terms was helpful, if a little overdone. Would I read the crap out of a grownup, expanded version of this? Heck yes.