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Chris McManus鈥檚 Right Hand, Left Hand (Weidenfeld & Nicolson, 拢7.99) won the Aventis science book prize this year. It鈥檚 well written, as you might expect, and full of interesting ideas. Many of us use different hands for different tasks. A left-handed writer may throw a ball right-handedly, for example. McManus explores this and many other fascinating puzzles with intelligence and enthusiasm.