The Body Machine Author:Chris Josephs "The Question and Answer Encyclopedia Series" WHICH are the main organs of the body, and how do they work? WHY do we need to breathe and to eat food in order to live? WHAT are our bones and muscles made of? How do broken bones repair themselves? HOW do the brain and nerves keep the body working, even when we are asleep? Inside: The questi... more »ons YOU ask - answered in pictures and words.« less