Amazon.com description: Product Description: Make a John Paul Jones naval costume while learning about sea battles of the Revolution. Learn about and try some Ndebele House Painting. Use your breath to turn a solution from basic to acidic. And make a personalized concrete paving stone. All this, dozens more explorations, printables, library lists, additional layers, web links and more are included in Layers of Learning Unit 3-20. This is part of a unit study covering four subjects: history, geography, science, and the arts. It is designed to be used family style with all ages from 1st graders up to 12th graders learning together. Each book is in full color and includes printables at the end. Learn more about the Layers of Learning Curriculum at www.layers-of-learning.com.