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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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