Read and find out about six simple machines—the lever, the wheel and axle, the pulley, the ramp, the wedge, and the screw—in this colorfully illustrated non

A very basic introduction to screws, levers, planes and more.

In Simple Machines: Lever, young learners in grades 1–3 will explore how levers give us the lift we need. From scissors to wheelbarrows, this 24-page title us

Learn about the different uses of levers. How does it work and why? These fun science books answer kids' questions about the world around them-and encourage the