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Paperback. Etat : new. Paperback. Have you ever wondered how a gull's wings work or how your heart is able to pump blood up against gravity, how a hot air balloon is able to lift hundreds of pounds just with hot air? These are just some of the amazing things that you will learn about - by creating your very own unique working versions. Welcome and share in the pleasure of finding things out! Click here to peek inside the book: This item is printed on demand. Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.…