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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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There are 20 feet of blood vessels in each square inch of human skin.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%