Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.