What is the Theory of Evolution? How do chemical reactions occur? Why is the human eye most receptive to only three colors? Get ready to explore the fascinating world of science in this boxed set of six encyclopedias. Well-labelled diagrams, and an extensive glossary of difficult words come as happy bonuses in these informative books.Well-labeled images Will educate and entertain young learners Builds a robust vocabulary Excellent for gifting and schools Child-friendly information