Written to introduce basic science concepts through comparing and contrasting, each book in this series features a pair of opposites, such as light and dark or renewable and nonrenewable energy. Large, clear photos support the text and have labels to reinforce important details. There are also diagrams showing such things as life cycles, sound waves, or the arrangement of particles in different states of matter. Glossary terms are in color to draw attention on the page. Each book ends with a chart contrasting the opposites, along with the URL for the publisher’s website to access a list of links for further information. The text is a bit long for primary grades but could be used by teachers to introduce a topic or read independently by older students. VERDICT The broad range of subjects makes this a versatile set for classroom use.