Describes many different kinds, uses, and benefits of pulleys. Provides examples of pulleys by showing a flagpole, a crane, an elevator and window blinds.
Red diggers, blue cars, yellow trucks, and more! For fans of the bestselling Amazing Machines series, this is a perfect way for young children to learn all about colors in a bright and engaging way, w
What's the opposite of big rockets? Small rockets! For fans of the bestselling Amazing Machines series, this is a perfect way for young children to learn all about opposites in a colorful, engaging wa
