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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%