MULLINS, Matt . The Elements . diags. ISBN 978-0-531-26323-5 ; ISBN 978-0-531-26585-7 . LC 2011010400. MULLINS, Matt . Energy . ISBN 978-0-531-26320-4 ; ISBN 978-0-531-26582-6 . LC 2011016234. MULLINS, Matt . Friction . ISBN 978-0-531-26321-1 ; ISBN 978-0-531-26583-3 . LC 2011010047. MULLINS, Matt . Gravity . ISBN 978-0-531-26322-8 ; ISBN 978-0-531-26584-0 . LC 2011009489. RAU, Dana Meachen . Simple Machines . ISBN 978-0-531-26324-2 ; ISBN 978-0-531-26586-4 . LC 2011007506. ea vol: 48p. (A True Book: Physical Science Series). photos. reprods. chron. further reading. glossary. index. Websites. CIP. Children's Press . 2011. PLB $28.; pap. $6.95. Gr 3-5 These attractive volumes will grab children's attention from the get-go. Eye-catching covers feature dramatic demonstrations of the topics, be it an image of upside-down skydivers plummeting through the clouds in Gravity or a child with his hair sticking straight up in Electricity . Each book opens with a challenge to "Find the Truth!": "Everything you are about to read is true except for one of the sentences on this page," and then encourages readers to find out which statement is false by reading on. What follow are four or five well-organized, clearly written chapters explaining the nature of the subject, the history of its discovery, and how it impacts our lives. Every title concludes with a page of statistics and resources, such as organizations and places to visit. Excellent choices for both reports and general interest.