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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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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 longest a person has survived after a heart transplant is 24 years.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.