3942862
9781904668718
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Who thought of building a catapult that could sling a cow a couple of kilometres over a castle wall? What made Leonardo design a parachute? Who fired the first cannon ball and how can a lemon power a digital clock? You can find the answers here, in this title of the Crafty Inventions series, and then model your own inventions -- from a miniature flush toilet to a cracking pop-gun.Mercury Books is the author of 'Age of New Ideas', published 2005 under ISBN 9781904668718 and ISBN 1904668712.
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