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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.