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Unbelievable facts about an amazing specimen -- YOU! Most of us eat, run, or sleep without thinking about it. But our bodies are masterful machines of intricate design that perform amazing feats daily. The fifth book in Annick's successful 50 Questions series guides readers through the details of how our bodies function, from the miracles of genetics, to immune cells shaped like sea monsters. With her engaging, lucid style, Lloyd Kyi incorporates recent scientific research to explain our body's complex workings. Kids will love finding the answers to questions such as: Do blood cells travel single file? (In our capillaries, blood cells have to squeeze through one at a time.) How is your spine like a racetrack? (Messages race down the nerves in your spinal cord faster than a NASCAR driver.