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The human body produces and destroys 15 million blood cells every second.
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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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People about to have surgery must tell their health care providers about all supplements they take.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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The horizontal fraction bar was introduced by the Arabs.