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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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.