More than 130 activity ideas - growing crystals, launching water rockets, testing a light dimmer, mapping elevations, testing soil - prompt students to make eye-opening discoveries in biology, chemistry, earth science, environmental science, and physics. Each activity ends by citing other related activities in the book. A special "more for less" section provides tips for getting and making scientific materials at bargain prices, and all activities are indexed by skills and subject areas. Grades K-8. Index. Conversion tables. Illustrated. Good Year Books. 306 pages. Third Edition.