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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The human body produces and destroys 15 million blood cells every second.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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On average, the stomach produces 2 L of hydrochloric acid per day.