It's a material world with fun facts and experiments about the natural materials found in our environment. Clear text and lab activities help children understand the science of density, acids and alkalis, chromatography, fermentation, and much more. History and quiz boxes, along with hands on experiments, help kids learn: - Why some objects float and others sink - To make their own natural color dyes - Why leaves change color in the fall - How to make their own litmus paper and conduct a pH test - About pigments and colors - Why some shapes are stronger than others