How Science Works Hiw

Suggests simple experiments that demonstrate facts about chemical reactions, energy, motion, light, sound, air, water, magnetism, electricity, electronics, and computers

Grade 4-8-- A visually enticing, large-format volume that aims to involve parents and children in the mutual exploration of scientific principles through hands-on experimentation. Hann begins by listing the requisite materials for investigation, the majority of which are household items. She encourages improvising when an object is not readily available. Each of the six sections-- matter; energy, force, and motion; light and sound; air and water; electricity and magnetism; and electronics and computers--combines a lively, understandable text with a number of activities and projects that illustrate the topic. Interspersed throughout are discovery sections that focus on individuals or events of scientific importance. The sections are logically arranged, but readers can skip around according to their own interests. The step-by-step instructions are very clear and include admonitions for adult supervision when advisable. The accompanying full-color photographic layouts are lavish and detailed, but not cluttered. They depict multiethnic boys and girls of varying ages (and occasionally adults) and clarify the steps of the experimental process in an imaginative and appealing manner. Diagrams are well designed, colorful, and clearly captioned. Measurements are presented in both metric and English units. Although minor, there are a few flaws. Occasionally, an undefined scientific term is used, and definitions for abbreviations of measurement could not always be located. A cut above most how-to science books.
-Sylvia V. Meisner, Allen Middle School, Greensboro, NC
Copyright 1991 Reed Business Information, Inc.

Subtitled 100 Ways Parents and Kids Can Share the Secrets of Science, this attractive collection is lamentably lacking in essential safety warnings. Although the introduction states that ``where adult supervision is essential, this is clearly stated,'' several experiments involve lighted candles or even a homemade alcohol burner without suggesting adult supervision; moreover, instructions for making the burner are dangerously inadequate- -e.g., there is no warning that alcohol spilled on hands or clothing is flammable. Aside from the safety issue, some experiments are without sufficient instructions. A model crane requires over 30 parts but the accompanying diagram, less than two inches square, gives no measurements, while a caption directs: ``You will need: balsa or plywood cut as shown.'' Good luck! Outstanding photos; glossary; extensive index. Beautiful, but unsafe! (Nonfiction. Adult) -- Copyright ©1991, Kirkus Associates, LP. All rights reserved.