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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.