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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.