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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

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