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Jacqui Bailey has spent a lot of her adult life working with children's books. She has been an editor and publisher of everything from picture books to encyclopedias, but mostly enjoys finding out amazing bits of information and then writing about them. She particularly likes writing about science, as the information so often turns out to be far stranger than fiction.

On the move Push and pull Big push, little push Heavy and light Crash! Change direction Stretch and squash Natural forces Slipping and sticking Fighting force All fall down Useful words Index