Human Body a Children's EncyclopediaHelp your child to understand the human body From your head to your toes, this encyclopedia for children takes you on a tour of the human body and explains how each part works. On every page, discover amazing facts about the human body. Did you know that you are made up of 100 trillion cells? Learn about blood vessels (capillaries, veins, and arteries) which, if they were laid out end to end, would wrap around the Earth twice! Find out what makes a