Sithu Sinley had written this book when she was in second grade and now she is about to be graduating as a senior from high school. At very young age she was fascinated by the circulatory system an...ver maisSithu Sinley had written this book when she was in second grade and now she is about to be graduating as a senior from high school. At very young age she was fascinated by the circulatory system and she wanted others to enjoy it as well.ver menos