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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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There are 60,000 miles of blood vessels in every adult human.
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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.