From creating artificial pearls to building a steam boiler, these vintage projects for indoors and outdoors offer a tremendous range of possibilities. Over 250 classic plans and instructions explain how to make model airplanes, greeting cards, a motion-picture camera, a radiophone, a cipher code, motor-driven sleds, and other projects. Drawn from the best of Popular Mechanics magazines from the 1910s and '20s, they combine the excitement and satisfaction of building and creating with the lasting value of learning the practical applications of scientific principles.
The step-by-step...

Kids can have fun as they discover the speed of the fastest animal, which insect can jump 500 times its own height, how many muscles you use when you smile, and dozens of other interesting and surprising facts. Each of these 46 challenges poses a question that can be answered by following a maze to its end. Solutions provided. Nature Fun Facts Mazes and other Spark titles offer a wide variety of engaging activities that will foster creativity in children ages 6 to 10. Previously published as Nature Trivia Mazes.