How does a combine harvester work? Why are a tractor's wheels so wide? This text contains answers to these questions and many more on how tractors work.
This is Book 4 in the Young Machines S. Series. See all Young Machines S. books here.
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Frances grew up with three younger brothers. She kept them in order by telling them stories and writing plays for them to perform (but they never turned up for rehearsals).
Now she has two children of her own to boss around, called Marianne and George. They give her lots of ideas for books. Frances thinks that the best time to mull over ideas is when you ar
