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There are 60,000 miles of blood vessels in every adult human.
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There are more sensory neurons in the tongue than in any other part of the body.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.