The Rats of NIMH were so intelligent that they learned how to use simple machines. They used them to build and move things, including Mrs. Frisby's house. Types of simple machines are the inclined plane, wheel and axle, screw, lever, pulley, and wedge. How many of these did you read about in the book? Look around your house and neighborhood. How many simple machines can you find? Send us your pictures of simple machines to include here (attach as jpg or gif files).
Below are some pages to help you learn more about simple machines. If you'd like to build an elevator out of K'nex, click on the picture for the plans.