This unique book of real chemistry and science for children illustrates the nature of physical and chemical change using the very smallest parts of things: atoms and molecules. It encourages children, ages 5-12, along with their parents or teachers, to become active learners of science, to discover meaning not only in the ideas and definitions of others, but also (and especially) in their own world. Chapters include: Evaporating, Condensing, Dissolving, Crystallizing, Mixing, Separating, Melting, Freezing, and Reacting.