Night and day, whether you're asleep or awake, your heart is always beating. Read and find out how your heart works and how to keep it healthy.
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Paul Showers wrote twenty books for the Let's-Read-and-Find-Out Science series, including favorites such as What Happens to a Hamburger? and Where Does the Garbage Go? Mr. Showers worked on the Detroit Free Press, the New York Herald Tribune, and for thirty years, the Sunday New York Times.
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