What is the Theory of Evolution? How do chemical reactions occur? Why is the human eye most receptive to only three colors? This encyclopedia on science will answer these and more hows and whys 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!