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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.