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Did you know?
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Did you know?
The FDA recognizes 118 routes of administration.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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On average, the stomach produces 2 L of hydrochloric acid per day.