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Top 10 Amazing Facts About Your Heart

Matters of the heart have baffled humans since the dawn of time, with sonnets and entire books devoted to the meaning of love. Now scientists are finding that the blood pump in your chest is just as complex. You can't live or love without it. Find out the sappy scoop on the heart, including how sex and laughter are indeed good for it, and how bad news really can break it. -- Jeanna Bryner