This book is part of a book series called Disgusting Body Facts .

This book has been graded for interest at 7-9 years.

There are 32 pages in this book. This book was published 2010 by Raintree .

Rebecca Rissman has written over 100 nonfiction books for young readers about science, math, and history. Her favorite letter in the alphabet is R because when you say it out loud you sound like a pirate! Angela Royston has written and edited many books for children about science and nature.