Why do your eyes blink? Why does your heart race when you run fast? How does your body know when to stop eating? This encyclopedia about the human body will answer these and many more whys and hows for you.Learning is made simpler with well-labelled diagrams and an extensive glossary of difficult words.Bonus: the engrossing book comes loaded with Isn't It Amazing—a section of fun facts to keep you glued for more.This encyclopedia is a must-read for all children!•