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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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There are 20 feet of blood vessels in each square inch of human skin.
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The horizontal fraction bar was introduced by the Arabs.
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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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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.