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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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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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Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.
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There are more nerve cells in one human brain than there are stars in the Milky Way.