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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.