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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.