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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Thyroid conditions may make getting pregnant impossible.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.