Students will have completed a unit on the six simple machines (lever, inclined plane, pulley, wedge, screw, and wheel and axle) before beginning this project. Students will choose to investigate an invention composed of one or more simple machines that has already been invented, or they will choose to build a device composed of one or more simple machines. The invention must be safe to operate and it should be one that can be demonstrated at school. It should be one that students use themselves in everyday life. It should not be complicated.This lesson plan was created as a result of the Girls Engaged in Math and Science, GEMS Project funded by the Malone Family Foundation.