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"Presents information on simple machines with a focus on screws. Explains what a screw is, how screws work, and includes examples of past and present uses. Intended for third to fifth grade students"--Provided by publisher.
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Previews available in: English
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Book Details
Table of Contents
What is a screw?
Sharp threads
Pushing ahead
Screwy gears
Nuts and bolts
Drilling bits
Early screws
Gaining an advantage
Surfing simple machines
Science in action
What have you learned?
Edition Notes
Includes index.


