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Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The average adult has about 21 square feet of skin.