"Presents information on simple machines with a focus on wedges. Explains what a wedge is, how wedges work, and includes examples of past and present uses. Intended for third to fifth grade students"--Provided by publisher.

Includes index.

What is a wedge -- Wicked wedges -- Which wedge is which? -- A wedge of history -- Complex machines -- Wedges in your world -- Wedges and stone -- Gaining an advantage -- Surfing simple machines -- Science in action -- What have you learned?.