Overview
Who designed the first wheel? Why do wheels need tyres? Full simple experiments help you find the answers to these questions.
Contents
Wheels and shape Life before wheels The first wheels Better wheels Modern wheels Tyres Different wheels Cogs and teeth Machines and cogs Cogs and energy Glossary Notes for adults Suggestions for further activities Other books to read Index
Author
Mandy Suhr is a qualified primary school teacher and experienced children's writer and publisher.
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