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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The average adult has about 21 square feet of skin.
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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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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.