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Did you know?
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 familiar sounds of your heart are made by the heart's valves as they open and close.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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The human body produces and destroys 15 million blood cells every second.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.