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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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

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

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The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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