Download or read book Snowball Launchers, Giant-Pumpkin Growers, and Other Cool Contraptions written by Tom Fox and published by Turtleback Books. This book was released on 2006-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For use in schools and libraries only. Twenty intriguing projects to make contraptions that illustrate gravity and electricity. Some of the instructions are somewhat complex and require adult supervision.