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Grade 2-3-Disorganized, superficial, and peppered with statements that range from simplistic to plain wrong, this overview of science is more apt to confuse than enlighten the readers for whom it is intended. Each volume takes on an apparently randomly chosen topic, which can vary in scope from Helping plants grow well or Dissolving to Habitats, Keeping healthy, and Earth and beyond. Aside from perfunctory indexes in each volume, there is no back matter, and despite much topical overlap, Solids and liquids, Changing from solids to liquids to gases, and Changing materials, for example, or Simple electricity and Changing circuits, there are no internal or external cross-references. Along with citing temperatures in centigrade only, Knapp shows inconsistent judgment about the vocabulary his readers will be able to handle, defining "microorganisms," "buoyancy," and "cholesterol," for example, but not "chlorophyll" or "electromagnets.