- All eleven books in this series aim to disguise math behind birthdays, hoping to give every Kiddo a level playing field to success, regardless of their gifts and fears. This is the first book in the series to help your little one get introduced to math in a fun and engaging way. “Not Dan” has a magical way to get math across through stories and interactions with many jungle friends, and in this book, you get to meet them all! Fully illustrated by Eric J. Carter and full of detail to keep kids entertained and educated! Enjoy!