(Bellwether Media, Aug. 1, 2019)
Wedges were some of the first tools humans ever created! Today, these simple machines are found all around, from doorstops to our own front teeth. Diagrams and simple text explain how wedges work, while experiments allow readers test the machines for themselves. Move through the history of wedges, from hand axes to handsaws, in this fascinating title for beginning readers. Pulleys, levers, and wedges have been around for thousands of years! This title introduces young readers to the science behind these simple machines and how they make our lives and work easier every day. Features such as diagrams explain tough concepts, while experiments let readers test the machines themselves. Readers will discover just how fun simple machines can be!