Kinetic Contraptions

The two dozen contraptions found in this handy resource can move across the land, over the sea, and through the air and can be assembled primarily from low-cost or free recycled materials, batteries, and a single motor. Some of the projects include constructing a hovercraft out of a Styrofoam plate, two corks, and binder clips; building a double-paddlewheeler out of paint stirrers, plastic bottles...